Updated on 2025/10/14

写真a

 
HITOSUGI TARO
 
Organization
School of Materials and Chemical Technology Specially Appointed Professor
Title
Specially Appointed Professor
External link

News & Topics

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Degree

  • Doctor (Engineering) ( 1999.3   The University of Tokyo )

  • Master (Engineering) ( 1996.3   The University of Tokyo )

  • Bachelor ( 1994.3   The University of Tokyo )

Research Interests

  • interface

  • surface

  • 固体物理化学

  • solid-state chemistry

  • thin film

  • oxide

Research Areas

  • Nanotechnology/Materials / Thin film/surface and interfacial physical properties

Education

  • The University of Tokyo   School of Engineering   Department of Superconductivity

    1996.4 - 1999.3

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  • The University of Tokyo   School of Engineering   Department of Superconductivity

    1994.4 - 1996.3

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    Country: Japan

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  • The University of Tokyo   The Faculty of Engineering

    1992.4 - 1994.3

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    Country: Japan

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  • The University of Tokyo

    1990.4 - 1992.3

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  • 神奈川県立柏陽高校

    1987.4 - 1990.3

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  • 横浜国立大学 教育学部附属 鎌倉中学校

    1984.4 - 1987.3

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  • Eaton Elementary School , CupertinoCA

    1980 - 1984

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  • 横浜市立日吉南小学校

    1984

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    Country: Japan

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  • サンフランシスコ日本語補習校

    1980 - 1984

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  • Collins Elementary School ,Cupertino CA

    1980 - 1984

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  • 大月市立猿橋小学校

    1983

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  • 大分市立明野東小学校

    1978 - 1980

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    Country: Japan

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Research History

  • The University of Tokyo, School of Science   Department of Chemistry   Professor

    2022.4

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  • Institute of Science Tokyo   Specially Appointed Professor

    2024.10 - 2026.3

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  • Tokyo Institute of Technology   Specially Appointed Professor

    2022.4 - 2024.9

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  • Tokyo Institute of Technology   Professor

    2016.4 - 2022.3

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  • 東京工業大学 大学院理工学研究科 応用化学系   教授

    2015.12 - 2016.3

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  • Tohoku University WPI Advanced Institute for Materials Research   Associate Professor

    2007.12 - 2015.12

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  • The University of Tokyo   Graduate School of Science, Department of Chemistry

    2003.10 - 2007.12

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  • Sony Corporation

    1999.4 - 2003.9

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  • Hitachi, Ltd.,   Predoctoral Fellow

    1996.4 - 1999.3

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  • 神奈川科学技術アカデミー(KAST) 非常勤研究員

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Professional Memberships

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Committee Memberships

  • 科学技術振興機構(JST)さきがけ [研究開発プロセス革新] AI・ロボットによる研究開発プロセス革新のための基盤構築と実践活用   領域アドバイザー  

    2024.4   

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  • APL Materials   Editorial Advisory Board  

    2024.1 - 2026.12   

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  • 日本学術会議   第26期無機化学分科会委員  

    2023.10   

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    Committee type:Academic society

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  • エヌエフ基金   研究開発奨励賞選考委員会委員  

    2023.7   

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  • 神奈川県立柏陽高等学校   学校運営協議会委員  

    2023.4   

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  • 応用物理学会薄膜・表面物理分科会   2023年度(第52期) ・2024年度(第53期) 幹事  

    2023.4 - 2025.3   

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  • 透明酸化物光・電子材料研究会   運営委員  

    2023   

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  • 東京大学   「再生可能エネルギー最大導入に向けた電気化学材料研究拠点」(DX-GEM) 副拠点長  

    2023   

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  • 日本表面真空学会関東支部   役員  

    2023   

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  • 名古屋大学   非常勤講師  

    2023   

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  • 東京大学   エネルギー総合学連携研究機構 教授  

    2022.12   

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  • 応用物理学会薄膜・表面物理分科会   2022年度(第51期) 幹事  

    2022.4 - 2023.3   

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  • 日本表面真空学会   国際連携委員会委員  

    2022 - 2025   

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  • 日本学術振興会   国際事業委員会書面評価員  

    2022   

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  • 科学研究費委員会   専門委員  

    2021.10 - 2022.10   

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  • 日本学術会議   連携会員  

    2021.7 - 2029.9   

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    Committee type:Academic society

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  • 応用物理学会薄膜・表面物理分科会   2021年度(第50期) 幹事  

    2021.4 - 2022.3   

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  • 2021年-2022年 マテリアル革新技術先導研究プログラム2021年度案件検討委員会 A文科   NEDO技術委員  

    2021.3 - 2022.3   

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  • 内閣府   「マテリアル戦略」有識者  

    2020.10   

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  • 東京工業大学   学長特別補佐  

    2020.10 - 2022.3   

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  • 応用物理学会   学会誌「応用物理」企画・編集委員  

    2020.4 - 2022.3   

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  • 大阪大学   非常勤講師  

    2020.4 - 2021.3   

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  • 科学研究費委員会   専門委員  

    2019.12 - 2020.11   

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  • 京都大学   非常勤講師  

    2019.6   

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  • 東京工業大学   物資・情報卓越教育院 副教育院長  

    2019.1 - 2022.3   

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  •   Associate Editor  

    2019   

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  • 科学研究費委員会   専門委員  

    2017.12 - 2018.11   

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  • 北海道大学   非常勤講師  

    2017.11   

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  • 東北大学   連携教授  

    2017.7 - 2021.3   

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  • APL Materials   Advisory Board  

    2017.2   

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  • 固体イオニクス学会   社員  

    2017   

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  • 文部科学省   科学技術・学術審議会専門委員  

    2017 - 2018   

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  • 日本学術振興会 先端ナノデバイス・材料テクノロジー第151委員会   委員  

    2016.4 - 2021.3   

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  • 文部科学省 科学技術政策研究所 科学技術予測センター   専門調査員  

    2016.4 - 2018.3   

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  • Science and Technology of Advanced Materials誌(STAM)   Associate Editors  

    2016 - 2025   

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  • 科学技術振興機構(JST) SICORP   アドバイザー職  

    2016   

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  • 応用物理学会   代議員  

    2015.4 - 2017.3   

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  • 日本学術振興会   第7回HOPEミーティング モデレーター  

    2015   

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  • 日本表面科学会   東北・北海道支部 幹事  

    2013 - 2016   

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  • 公益財団法人 新世代研究所   “界面ナノ科学”研究会 委員長  

    2012 - 2018   

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  • 科学技術振興機構   さきがけ研究員(兼任)”新物質科学と元素戦略”領域  

    2011.4 - 2014.3   

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  • 日本学術振興会   日仏先端科学シンポジウム(JFFoS) プランニング・グループ・メンバー  

    2011 - 2014   

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  • 日本表面科学会   会誌「表面科学」編集委員  

    2004 - 2010   

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Papers

  • Interpretation of Kelvin Probe Force Measurements in Solid-State Electrochemical Cells Reviewed

    Franjo Weber, Chao Zhu, Shigeru Kobayashi, Till Fuchs, Taro Hitosugi, Jürgen Janek, Rüdiger Berger

    ACS Applied Materials & Interfaces   2025.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsami.5c10182

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  • Self-driving laboratories in Japan Reviewed

    Naruki Yoshikawa, Yuki Asano, Don N. Futaba, Kanako Harada, Taro Hitosugi, Genki N. Kanda, Shoichi Matsuda, Yuuya Nagata, Keisuke Nagato, Masanobu Naito, Tohru Natsume, Kazunori Nishio, Kanta Ono, Haruka Ozaki, Woosuck Shin, Junichiro Shiomi, Kunihiko Shizume, Koichi Takahashi, Seiji Takeda, Ichiro Takeuchi, Ryo Tamura, Koji Tsuda, Yoshitaka Ushiku

    Digital Discovery   4 ( 6 )   1384 - 1403   2025.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    This perspective highlights the current state of self-driving laboratories (SDLs) in Japan. It also outlines how national funding, community collaboration, and industry support their growth, along with future directions.

    DOI: 10.1039/d4dd00387j

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  • Solid Thin-Film Battery Using a Densely Packed LiNi0.5Mn1.5O4 Crystal Layer

    Shigeru Kobayashi, Nobuyuki Zettsu, Kazunori Nishio, Ryota Shimizu, Toshiki Imabori, Yoshiki Saito, Katsuya Teshima, Taro Hitosugi

    ACS Omega   10 ( 16 )   16073 - 16078   2025.4

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsomega.4c09393

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  • Investigating the Interface of Li{N(SO2F)2}(NCCH2CH2CN)2 Molecular Crystal Electrolytes for 5 V Class Solid-State Batteries

    Ruijie Zheng, Shigeru Kobayashi, Mana Ogawa, Hiroto Katsuragawa, Yuki Watanabe, Jun Deng, Ryo Nakayama, Kazunori Nishio, Ryota Shimizu, Yoshitaka Tateyama, Makoto Moriya, Taro Hitosugi

    ACS Applied Materials & Interfaces   17 ( 14 )   21951 - 21957   2025.3

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsami.4c22076

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  • Extremely Low Electrical Contact Resistance at the Interface of Carbon-Fiber-Based Gas Diffusion Layer and Anatase TiO2 Thin Films

    Tomohito Sudare, Han Xu, Ryo Nakayama, Reiichi Ueda, Rento Naito, Ryota Shimizu, Yumie Miura, Kentaro Kaneko, Naoomi Yamada, Taro Hitosugi

    ACS Applied Electronic Materials   7 ( 7 )   2785 - 2792   2025.3

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsaelm.4c02236

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  • Molecular Crystalline Electrolyte Based on Li{N(SO2CF3)2} and Succinonitrile with Closely Contacted Grain Boundary Interfaces Exhibiting Selective Li-Ion Conductivity and 5 V-Class Electrochemical Stability

    Hiroto Katsuragawa, Sawako Mori, Yusuke Tago, Shota Maeda, Shuichi Matsuda, Hikaru Toriu, Ryo Nakayama, Shigeru Kobayashi, Taro Hitosugi, Makoto Moriya

    ACS Applied Energy Materials   8 ( 6 )   3599 - 3605   2025.3

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsaem.4c03207

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  • Reduced resistance at molecular-crystal electrolyte and LiCoO2 interfaces for high-performance solid-state lithium batteries

    Yuki Watanabe, Shigeru Kobayashi, Zheng Ruijie, Deng Jun, Kenjiro Tanaka, Kazunori Nishio, Ryo Nakayama, Ryota Shimizu, Makoto Moriya, Taro Hitosugi

    APL Materials   13 ( 1 )   2025.1

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    Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    Molecular crystal electrolytes are promising solid electrolytes owing to their ionic conductivity and mechanical flexibility. However, solid-state batteries using these electrolytes suffer from the large resistance at the interfaces with positive electrodes. Herein, we fabricate a battery using Li{N(SO2F)2}(NCCH2CH2CN)2, referred to as Li(FSA)(SN)2, a molecular-crystal electrolyte, and demonstrate the stable thin-film battery cycling. The novel fabrication method forms electrochemically stable interfaces, allowing the thin-film batteries to cycle at a current density of up to 500 μA cm−2 in the voltage range of 3.00–4.05 V vs Li/Li+. This current density is 500 times higher than that reported previously. Notably, the Li(FSA)(SN)2–LiCoO2 interface resistance (24 Ω cm2) is comparable to that of the interface of liquid-electrolyte and LiCoO2 in Li-ion batteries. Furthermore, inserting an amorphous Li3PO4 layer into the Li(FSA)(SN)2–LiCoO2 interface enables stable cycling up to 4.30 V vs Li/Li+, suppressing the decomposition of electrolytes. These quantitative investigations and interfacial controls pave the way for the practical applications of molecular-crystal electrolytes to solid-state batteries.

    DOI: 10.1063/5.0241289

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  • Elucidating the Role of Interstitial Oxygen in Transparent Conducting Anatase TiO2 by Polarized X-ray Absorption Spectroscopy Study

    Tomohito Sudare, Ryota Shimizu, Naoomi Yamada, Yumie Miura, Reiichi Ueda, Ryo Nakayama, Shigeru Kobayashi, Kentaro Kaneko, Taro Hitosugi

    Chemistry of Materials   37 ( 1 )   480 - 488   2024.12

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acs.chemmater.4c02896

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  • Isotope-dependent site occupation of hydrogen in epitaxial titanium hydride nanofilms Reviewed

    T. Ozawa, Y. Sugisawa, Y. Komatsu, R. Shimizu, T. Hitosugi, D. Sekiba, K. Yamauchi, I. Hamada, K. Fukutani

    Nature Communications   2024.11

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1038/s41467-024-53838-6

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  • Extraction of optimal synthesis conditions from scientific literature using a knowledge graph Reviewed

    Shigeru Kobayashi, Norikazu Kuwashiro, Fumiaki Itoh, Dai Sakurai, Taro Hitosugi

    Science and Technology of Advanced Materials: Methods   4 ( 1 )   2024.9

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    Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/27660400.2024.2395242

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  • Quantitative study of oxygen evolution reaction using LiNi0.5Mn1.5O4 thin-film electrodes Reviewed

    Kentaro Hatagami, Kazunori Nishio, Ryota Shimizu, Taro Hitosugi

    Journal of Applied Physics   135 ( 23 )   2024.6

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    Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    The development of water electrolysis catalysts that accelerate the oxygen evolution reaction (OER) is a crucial challenge. Ni-based oxides are promising OER catalysts; however, quantitative studies of Ni-based oxides remain unexplored. In this study, we quantitatively evaluated the OER activity of LiNi0.5Mn1.5O4 as a thin-film electrode catalyst. The LiNi0.5Mn1.5O4 thin film fabricated using a sputtering method exhibited a current density of 6.6 and ∼2.6 mAcm−2 for geometric and estimated areas, respectively, at 1.78 V vs. a reversible hydrogen electrode. X-ray photoelectron spectroscopy indicated the presence of Ni3+ in the as-grown and post-OER LiNi0.5Mn1.5O4 thin films. These results suggest that Ni3+ plays a key role in the OER of LiNi0.5Mn1.5O4.

    DOI: 10.1063/5.0203381

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  • Cyclic electrochemical reactions on a Li-metal negative electrode having a low-resistance interface with a solid-state electrolyte Reviewed

    Hideaki Kuwajima, Yuki Watanabe, Keita Ikezawa, Toshikazu Yasuda, Ryota Shimizu, Tomoki Masuyama, Yuri Nakayama, Taro Hitosugi

    Applied Physics Letters   124 ( 18 )   2024.4

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    Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    Li metal is a promising negative-electrode material for high-energy-density all-solid-state batteries. However, the surface of Li metal is prone to oxidation, which results in the formation of a contamination layer at the Li metal–solid electrolyte interface. This interfacial contamination layer is the root cause of short-circuiting and poor cycle stability, thus hindering the development of all-solid-state batteries. Prior studies have not quantitatively assessed the effect of the above layer on battery performance. Herein, the degradation mechanisms affecting the interface are investigated using alternating-current impedance measurements and Li plating–stripping cycle tests for a symmetric cell. A thin contamination layer results in a Li–electrolyte interface with a low resistance of 0.20 kΩ cm2 and stable Li plating–stripping behavior at a current density of 3 mA cm−2, whereas a thick contamination layer results in a high interfacial resistance of 2.0 kΩ cm2. The thinning of the contamination layer on Li metal enhances the stability of the Li–electrolyte interface and Li plating–stripping kinetics.

    DOI: 10.1063/5.0201538

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  • Impact of annealing on the resistance of Li3PO4 electrolyte–LiNi0.5Mn1.5O4 electrode interfaces Reviewed

    Hideyuki Kawasoko, Susumu Shiraki, Kazunori Nishio, Asuka Oi, Ryota Shimizu, Taro Hitosugi

    Applied Physics Letters   124 ( 18 )   2024.4

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    Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    The operation of solid-state Li batteries, which are promising power supplies for portable electronic devices and electric vehicles, is accompanied by heating. Therefore, investigating the thermal stability of battery systems is essential. In this study, we report the impact of annealing on the interface of a Li3PO4 electrolyte and LiNi0.5Mn1.5O4 electrode in thin-film batteries. The batteries with the interface annealed at 200 °C show low Li3PO4–LiNi0.5Mn1.5O4 interface resistance of 7.2 Ω cm2. Furthermore, the batteries exhibit stable charge–discharge characteristics with high current density up to 1170 μA cm−2, similar to those of batteries with the non-annealing interface. The batteries with the interface annealed at 450 °C show high Li3PO4–LiNi0.5Mn1.5O4 interface resistance of 490 Ω cm2, resulting in low battery performance. X-ray photoemission spectroscopy indicates that the P in Li3PO4 is reduced by high-temperature annealing, possibly causing the performance degradation of batteries. This study provides an in-depth understanding of the interfaces of solid-state batteries and is expected to facilitate the development of thermally stable batteries.

    DOI: 10.1063/5.0199278

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  • Fabrication of conductive Nb-doped anatase TiO2 thin films by mist chemical vapor deposition using aqueous solutions of water-soluble Ti and Nb compounds

    Rento Naito, Megumi Ariga, Kaede Makiuchi, Ayaka Nakamura, Tomohito Sudare, Ryo Nakayama, Ryota Shimizu, Kentaro Kaneko, Yasushi Sato, Taro Hitosugi, Yamada Naoomi

    Japanese Journal of Applied Physics   2024.3

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    Electrically conductive Nb-doped anatase TiO2 (Ti1-xNbxO2: TNO) films can be fabricated through mist chemical vapor deposition using aqueous precursor solutions of water-soluble oxo-peroxo-glycolato titanium complex and ammonium niobium oxalate. Post-deposition annealing in vacuum crystallizes the as-deposited amorphous films into a conductive anatase phase, leading to the fabrication of conductive TNO films. Notably, the addition of H2O2 to the precursor solutions enhances both the crystallinity and conductivity of the annealed TNO films. A Ti0.77N0.23O2 film, annealed at 700 °C, exhibits a resistivity of 2.0 × 10-2 Ω cm at ambient temperature. In general, the solution-based fabrication of TiO2 films relies on organic solvents, which are sometimes toxic and explosive. Here, we demonstrate for the first time that conductive TNO films can be prepared from less toxic and nonflammable aqueous solutions. These findings mark a significant advancement towards a more environmentally compatible process for fabricating TNO films with sufficient conductivity.

    DOI: 10.35848/1347-4065/ad31d6

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    Other Link: https://iopscience.iop.org/article/10.35848/1347-4065/ad31d6/pdf

  • Observation of resonant tunneling of proton from octahedral to tetrahedral sites in Pd

    Takahiro Ozawa, Hiroshi Nakanishi, Koichi Kato, Ryota Shimizu, Taro Hitosugi, Katsuyuki Fukutani

    Journal of Physics and Chemistry of Solids   185   111741 - 111741   2024.2

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jpcs.2023.111741

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  • Hydrogen absorption in an epitaxial thin film of high-entropy perovskite oxide Reviewed

    Takahiro Ozawa, Kaidong Wang, Kazunori Nishio, Ryota Shimizu, Taro Hitosugi, Katsuyuki Fukutani

    Journal of Vacuum Science & Technology A   42 ( 2 )   2024.1

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    Publishing type:Research paper (scientific journal)   Publisher:American Vacuum Society  

    We synthesized an epitaxial film of high-entropy perovskite oxide (HEPO) consisting of three elements (Ca, Sr, Ba) in the A site and 12 elements (Si, Ti, Cr, Mn, Fe, Co, Ni, Ge, Zr, Sn, Ce, Hf) in the B site of ABO3, and investigated hydrogen absorption properties in the HEPO film. The hydrogen depth profile was measured by nuclear reaction analysis via the 1H(15N,αγ)12C reaction, showing the hydrogen absorption in the HEPO film with a maximum atomic concentration of 0.3 in the ABO3 unit. The diffusion coefficient of H in the film was analyzed from the H depth profile, and the activation barrier for diffusion was estimated to be (0.54±0.13) eV. An absorption band was observed at 3290 cm−1 in the infrared absorption spectrum, which corresponds to the O–H stretching vibration. Simultaneous measurements of nuclear reaction and resistance revealed that the HEPO film remained electrically insulating regardless of the hydrogen concentration. We demonstrated that hydrogen is incorporated in HEPO forming OH species while keeping HEPO electrically insulating.

    DOI: 10.1116/6.0003256

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  • Physical vapor deposition of an oriented metal–organic framework HKUST-1 thin film on an insulating substrate

    Shunta Iwamoto, Ryo Nakayama, Seoungmin Chon, Ryota Shimizu, Taro Hitosugi

    Journal of Materials Chemistry A   2024

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    This study reports the synthesis of a (111)-oriented HKUST-1 ([Cu3(BTC)2], BTC = 1,3,5-benzenetricarboxylate) thin film on an insulating glass substrate using a combination of physical vapor deposition and solvent vapor annealing.

    DOI: 10.1039/d4ta01298d

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  • Orientation Control of a Two-Dimensional Conductive Metal–Organic Framework Thin Film by a Pyridine Vapor-Assisted Dry Process Reviewed

    Seoungmin Chon, Ryo Nakayama, Shunta Iwamoto, Shigeru Kobayashi, Ryota Shimizu, Taro Hitosugi

    ACS Applied Materials & Interfaces   15 ( 48 )   56057 - 56063   2023.11

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsami.3c14401

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  • High H Conductivities along the ab-Planes of La2LiHO3 Epitaxial Thin Films Reviewed

    Yuki Sasahara, Takashi Hirose, Masataka Yoshimoto, Naoki Matsui, Shigeru Kobayashi, Hiroki Ubukata, Fumitaka Takeiri, Kota Suzuki, Masaaki Hirayama, Kazunori Nishio, Ryota Shimizu, Ryoji Kanno, Genki Kobayashi, Taro Hitosugi

    Crystal Growth & Design   2023.9

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acs.cgd.3c00376

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  • Synthesis of polyacene by using a metal–organic framework

    Takashi Kitao, Takumi Miura, Ryo Nakayama, Yusuke Tsutsui, Yee Seng Chan, Hironobu Hayashi, Hiroko Yamada, Shu Seki, Taro Hitosugi, Takashi Uemura

    Nature Synthesis   2023.5

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    The acene series, an important class of linearly polycyclic aromatic hydrocarbons, are of interest owing to their unique physicochemical features. With an increase in the number of fused benzene rings, acenes display an evolution of electronic structure and properties. Thus, efforts have been devoted to the synthesis of longer acenes, with dodecacene being the longest acene (12 fused benzene rings) reported to date. However, the formation of polymeric acenes with numerous benzene rings, namely polyacene, has yet to be realized. Herein, we present a methodology for the synthesis of polyacene mediated by a metal–organic framework. Nanoconfined synthesis of precursor polymers in the channels of the metal–organic framework and the subsequent dehydro-aromatization reaction produced polyacene that was overwhelmingly longer than the previously reported acenes. The scalable synthesis of polyacene allowed us to unveil the stability and electronic properties of polyacene, paving the way for their widespread applications in optoelectronic and magnetic devices.

    DOI: 10.1038/s44160-023-00310-w

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    Other Link: https://www.nature.com/articles/s44160-023-00310-w

  • Search for a space charge layer in thin film battery materials with low-energy muons

    Jun Sugiyama, Elisabetta Nocerino, Ola K. Forslund, Yasmine Sassa, Martin Månsson, Shigeru Kobayashi, Kazunori Nishio, Taro Hitosugi, Andreas Suter, Thomas Prokscha

    Journal of Physics: Conference Series   2462 ( 1 )   012046 - 012046   2023.3

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    Abstract

    In an all solid state Li-ion battery, it is crucial to reduce ionic resistivity at the interface between the electrode and the electrolyte in order to enhance Li+ mobility across the interface. Recent first principles calculations predict the presence of a space-charge layer (SCL) at the interface due to the difference in the Li+ chemical potential at the interface between two different materials, as in the metal-semiconductor junction in electronic devices. However, the presence of SCL has never been experimentally observed. Our first attempt in a fresh multilayer sample, Cu(10 nm)/Li3PO4(50 nm)/LiCoO2(100 nm) on a sapphire substrate, with low-energy µ+SR (LE µ+SR) revealed a gradual change in the nuclear magnetic field distribution width as a function of implantation depth even across the interface between Li3PO4 and LiCoO2. This implies that the change in the field distribution width at SCL of the sample is too small to be detected by LE µ+SR.

    DOI: 10.1088/1742-6596/2462/1/012046

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  • Protons Inside the LiCoO2 Electrode Largely Increase Electrolyte–Electrode Interface Resistance in All-Solid-State Li Batteries

    Shigeru Kobayashi, Kazunori Nishio, Markus Wilde, Katsuyuki Fukutani, Ryota Shimizu, Taro Hitosugi

    The Journal of Physical Chemistry C   127 ( 9 )   4684 - 4688   2023.2

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    DOI: 10.1021/acs.jpcc.2c06620

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  • Efficiency of electron doping to monolayer hexagonal boron nitride by alkali metals

    S. Ichinokura, A. Hemmi, H. Cun, K. Tanaka, R. Shimizu, T. Hitosugi, T. Greber, T. Hirahara

    Applied Physics Letters   122 ( 7 )   071601 - 071601   2023.2

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    We investigated electron doping of monolayer hexagonal boron nitride (hBN) on metallic substrates by doping alkali metals (AMs). The valence band maximum (VBM) of hBN/Rh after doping with Li and Cs was directly observed using angle-resolved photoemission spectroscopy in a wide wavenumber space. The valence band shift resulting from doping confirms the vacuum level alignment model. Furthermore, when the same AM is used, the resultant binding energy of VBM was almost identical regardless of the substrate, even if it differs by [Formula: see text] eV before doping, which we found by comparison with the literature. This independence from the substrate is explained by an extension of the vacuum level alignment model, wherein the VBM is determined by the work function of the AM when it intercalates to the interface as well as adsorbs on surfaces of hBN. It means that the doping of Cs, which has the lowest work function, gives the deepest binding energy at VBM. This is evaluated as 5.7 eV in our experiments.

    DOI: 10.1063/5.0140074

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  • Identification of OH groups on SrTiO3(100)-( 13×13)-R33.7° reconstructed surface by non-contact atomic force microscopy and scanning tunneling microscopy

    Daiki Katsube, Ryota Shimizu, Yoshiaki Sugimoto, Taro Hitosugi, Masayuki Abe

    Applied Physics Letters   122 ( 7 )   071602 - 071602   2023.2

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    Atomic resolution imaging of a SrTiO3(100)-([Formula: see text])-R33.7° reconstructed surface using non-contact atomic force microscopy (NC-AFM) and its simultaneous measurement with scanning tunneling microscopy (STM) is presented. Simultaneous STM and NC-AFM imaging reveals three patterns of image contrast depending on the tip apex condition and the relationship between the SrTiO3(100)-([Formula: see text])-R33.7° surface reconstructed structure and the NC-AFM image contrast. The NC-AFM image contrast variation is deduced from the tip apex polarity on the basis of an analysis of two images with opposite contrast. This interpretation is consistent with the results of simultaneous imaging of the SrTiO3(100)-([Formula: see text])-R33.7° surface. Furthermore, the results and interpretation identified an OH group, which is one of the surface defects, and this adsorption site.

    DOI: 10.1063/5.0139493

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  • Fabrication and Growth Orientation Control of NaBH4 Epitaxial Thin Films Using Infrared Pulsed-Laser Deposition Reviewed International coauthorship International journal

    Ryo Nakayama, Yuto Kawaguchi, Ryota Shimizu, Kazunori Nishio, Hiroyuki Oguchi, Sangryun Kim, Shin-ichi Orimo, Taro Hitosugi

    Crystal Growth & Design   22 ( 11 )   6616 - 6621   2022.11

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    DOI: 10.1021/acs.cgd.2c00813

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  • Selective Epitaxial Growth of Ca2NH and CaNH Thin Films by Reactive Magnetron Sputtering under Hydrogen Partial Pressure Control

    Seoungmin Chon, Yuki Sugisawa, Shigeru Kobayashi, Kazunori Nishio, Markus Wilde, Natsuko Kishi, Daiichiro Sekiba, Katsuyuki Fukutani, Taro Hitosugi, Ryota Shimizu

    The Journal of Physical Chemistry Letters   13 ( 43 )   10169 - 10174   2022.10

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    DOI: 10.1021/acs.jpclett.2c02617

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  • Modifying the Interface between the Solvated Ionic Liquid Electrolyte and Positive Electrode to Boost Lithium-Ion Battery Performance

    Jun Deng, Kazunori Nishio, Satoru Ichinokura, Yuki Watanabe, Kurei Edamura, Ryo Nakayama, Ryota Shimizu, Toru Hirahara, Taro Hitosugi

    ACS Applied Energy Materials   5 ( 9 )   10891 - 10896   2022.9

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    DOI: 10.1021/acsaem.2c01533

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  • Immense Reduction in Interfacial Resistance between Sulfide Electrolyte and Positive Electrode Reviewed

    Kazunori Nishio, Daisuke Imazeki, Kosuke Kurushima, Yuki Takeda, Kurei Edamura, Ryo Nakayama, Ryota Shimizu, Taro Hitosugi

    ACS Applied Materials & Interfaces   14 ( 30 )   34620 - 34626   2022.8

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    DOI: 10.1021/acsami.2c05896

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  • Van Hove singularity and Lifshitz transition in thickness-controlled Li-intercalated graphene

    S. Ichinokura, M. Toyoda, M. Hashizume, K. Horii, S. Kusaka, S. Ideta, K. Tanaka, R. Shimizu, T. Hitosugi, S. Saito, T. Hirahara

    Physical Review B   105 ( 23 )   2022.6

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    DOI: 10.1103/physrevb.105.235307

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  • Tuning of Bayesian optimization for materials synthesis: simulation of the one-dimensional case

    Ryo Nakayama, Ryota Shimizu, Taishi Haga, Takefumi Kimura, Yasunobu Ando, Shigeru Kobayashi, Nobuaki Yasuo, Masakazu Sekijima, Taro Hitosugi

    Science and Technology of Advanced Materials: Methods   2022.4

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    DOI: 10.1080/27660400.2022.2066489

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  • Repeatable Photoinduced Insulator-to-Metal Transition in Yttrium Oxyhydride Epitaxial Thin Films

    Yuya Komatsu, Ryota Shimizu, Ryuhei Sato, Markus Wilde, Kazunori Nishio, Takayoshi Katase, Daiju Matsumura, Hiroyuki Saitoh, Masahiro Miyauchi, Jonah R. Adelman, Ryan M. L. McFadden, Derek Fujimoto, John O. Ticknor, Monika Stachura, Iain McKenzie, Gerald D. Morris, W. Andrew MacFarlane, Jun Sugiyama, Katsuyuki Fukutani, Shinji Tsuneyuki, Taro Hitosugi

    Chemistry of Materials   2022.4

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    DOI: 10.1021/acs.chemmater.1c03450

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  • Synthesis of High-Entropy Layered Oxide Epitaxial Thin Films: LiCr<inf>1/6</inf>Mn<inf>1/6</inf>Fe<inf>1/6</inf>Co<inf>1/6</inf>Ni<inf>1/6</inf>Cu<inf>1/6</inf>O<inf>2</inf>

    Kaidong Wang, Kazunori Nishio, Koji Horiba, Miho Kitamura, Kurei Edamura, Daisuke Imazeki, Ryo Nakayama, Ryota Shimizu, Hiroshi Kumigashira, Taro Hitosugi

    Crystal Growth and Design   22 ( 2 )   1116 - 1122   2022.2

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    DOI: 10.1021/acs.cgd.1c01076

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  • Drastic Reduction of the Solid Electrolyte–Electrode Interface Resistance via Annealing in Battery Form

    Shigeru Kobayashi, Elvis F. Arguelles, Tetsuroh Shirasawa, Shusuke Kasamatsu, Koji Shimizu, Kazunori Nishio, Yuki Watanabe, Yusuke Kubota, Ryota Shimizu, Satoshi Watanabe, Taro Hitosugi

    ACS Applied Materials & Interfaces   2022.1

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    DOI: 10.1021/acsami.1c17945

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  • Bayesian sparse modeling of extended x-ray absorption fine structure to determine interstitial oxygen positions in yttrium oxyhydride epitaxial thin film

    Hiroyuki Kumazoe, Yasuhiko Igarashi, Fabio Iesari, Ryota Shimizu, Yuya Komatsu, Taro Hitosugi, Daiju Matsumura, Hiroyuki Saitoh, Kazunori Iwamitsu, Toshihiro Okajima, Yoshiki Seno, Masato Okada, Ichiro Akai

    AIP Advances   11 ( 12 )   125013 - 125013   2021.12

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    DOI: 10.1063/5.0071166

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  • Ionic Rectification across Ionic and Mixed Conductor Interfaces

    Kazunori Nishio, Satoru Ichinokura, Akitaka Nakanishi, Koji Shimizu, Yasutaka Kobayashi, Naoto Nakamura, Daisuke Imazeki, Ryota Shimizu, Toru Hirahara, Satoshi Watanabe, Taro Hitosugi

    Nano Letters   2021.11

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    DOI: 10.1021/acs.nanolett.1c03872

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  • Single Molecular Adsorption of Terbium(III) Bis-phthalocyaninato (TbPc2) Governed by Two Surface Reconstructions of Perovskite Type SrVO3 Epitaxial Ultrathin Film

    Hirofumi Oka, Keiichi Katoh, Yoshinori Okada, Daichi Oka, Taro Hitosugi, Masahiro Yamashita, Tomoteru Fukumura

    Chemistry Letters   50 ( 8 )   1489 - 1492   2021.8

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    DOI: 10.1246/cl.210270

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  • Epitaxial Growth of EuF2and EuO Thin Films Based on Spontaneous Anion Diffusion from Substrates

    Xin Dai, Yuya Komatsu, Ryota Shimizu, Taro Hitosugi

    Crystal Growth and Design   21 ( 8 )   4468 - 4472   2021.8

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    DOI: 10.1021/acs.cgd.1c00364

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  • Relaxation of the Interface Resistance between Solid Electrolyte and 5 V-Class Positive Electrode

    Ryo Nakayama, Kazunori Nishio, Daisuke Imazeki, Naoto Nakamura, Ryota Shimizu, Taro Hitosugi

    Nano Letters   21 ( 13 )   5572 - 5577   2021.7

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    DOI: 10.1021/acs.nanolett.1c01059

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  • Peculiarly fast Li-ion conduction mechanism in a succinonitrile-based molecular crystal electrolyte: a molecular dynamics study

    Ryoma Sasaki, Makoto Moriya, Yuki Watanabe, Kazunori Nishio, Taro Hitosugi, Yoshitaka Tateyama

    JOURNAL OF MATERIALS CHEMISTRY A   9 ( 26 )   14897 - 14903   2021.7

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    DOI: 10.1039/d1ta02809j

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  • Absence of ferromagnetism in MnBi2Te4/Bi2Te3 down to 6 K

    T. Fukasawa, S. Kusaka, K. Sumida, M. Hashizume, S. Ichinokura, Y. Takeda, S. Ideta, K. Tanaka, R. Shimizu, T. Hitosugi, T. Hirahara

    Physical Review B   103 ( 20 )   2021.5

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    DOI: 10.1103/physrevb.103.205405

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  • Tuning the Schottky Barrier Height at the Interfaces of Metals and Mixed Conductors

    Kazunori Nishio, Tetsuroh Shirasawa, Koji Shimizu, Naoto Nakamura, Satoshi Watanabe, Ryota Shimizu, Taro Hitosugi

    ACS Applied Materials and Interfaces   13 ( 13 )   15746 - 15754   2021.4

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    DOI: 10.1021/acsami.0c18656

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  • Clean Solid–Electrolyte/Electrode Interfaces Double the Capacity of Solid-State Lithium Batteries

    Hideyuki Kawasoko, Tetsuroh Shirasawa, Kazunori Nishio, Ryota Shimizu, Susumu Shiraki, Taro Hitosugi

    ACS Applied Materials & Interfaces   13 ( 4 )   5861 - 5865   2021.2

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    DOI: 10.1021/acsami.0c21586

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  • High Li-Ion Conductivity in Li{N(SO2F)(2)}(NCCH2CH2CN)(2) Molecular Crystal

    Kenjiro Tanaka, Yusuke Tago, Mitsuru Kondo, Yuki Watanabe, Kazunori Nishio, Taro Hitosugi, Makoto Moriya

    NANO LETTERS   20 ( 11 )   8200 - 8204   2020.11

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    DOI: 10.1021/acs.nanolett.0c03313

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  • Autonomous materials synthesis by machine learning and robotics

    Ryota Shimizu, Shigeru Kobayashi, Yuki Watanabe, Yasunobu Ando, Taro Hitosugi

    APL MATERIALS   8 ( 11 )   2020.11

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    DOI: 10.1063/5.0020370

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  • Effects of Anisotropy in Rutile TiO2on the Performance of Solid-State Lithium Batteries

    Daisuke Imazeki, Christopher Cornelis Van Gils, Kazunori Nishio, Ryota Shimizu, Taro Hitosugi

    ACS Applied Energy Materials   3 ( 9 )   8338 - 8343   2020.9

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    DOI: 10.1021/acsaem.0c00910

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  • Impact of Surface Roughness on Recrystallization of an α-Al2O3(001) Single Crystal to α-AlO(OH) Diaspore Microcrystals

    Yuki Sasahara, Koki Kanatani, Masayuki Matsuhisa, Yuji Wada, Ryota Shimizu, Norimasa Nishiyama, Taro Hitosugi

    ACS Omega   5 ( 37 )   23520 - 23523   2020.9

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    DOI: 10.1021/acsomega.0c01376

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  • Epitaxial Thin Film Growth of Europium Dihydride

    Yuya Komatsu, Ryota Shimizu, Markus Wilde, Shigeru Kobayashi, Yuki Sasahara, Kazunori Nishio, Kei Shigematsu, Akira Ohtomo, Katsuyuki Fukutani, Taro Hitosugi

    Crystal Growth and Design   20 ( 9 )   5903 - 5907   2020.9

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    DOI: 10.1021/acs.cgd.0c00602

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  • Polarity reversal of the charge carrier in tetragonal TiHx (x = 1.6-2.0) at low temperatures

    Ryota Shimizu, Yuki Sasahara, Ikutaro Hamada, Hiroyuki Oguchi, Shohei Ogura, Tetsuroh Shirasawa, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Shin-ichi Orimo, Katsuyuki Fukutani, Taro Hitosugi

    PHYSICAL REVIEW RESEARCH   2 ( 3 )   2020.9

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    DOI: 10.1103/PhysRevResearch.2.033467

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  • Width-induced metal–insulator transition in SrVO3 lateral nanowires spontaneously formed on the ultrathin film Reviewed

    Hirofumi Oka, Yoshinori Okada, Kenichi Kaminaga, Daichi Oka, Taro Hitosugi, Tomoteru Fukumura

    Applied Physics Letters   117 ( 5 )   051603 - 051603   2020.8

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    DOI: 10.1063/5.0018240

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  • Diffusion of F atoms from fluoride substrates promotes the epitaxial growth of metal fluorides Reviewed

    Xin Dai, Yuya Komatsu, Ryota Shimizu, Taro Hitosugi

    Applied Physics Express   13 ( 8 )   085507 - 085507   2020.8

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    DOI: 10.35848/1882-0786/aba22d

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  • Visible-light-driven photocatalysis via reductant-to-band charge transfer in Cr(III) nanocluster-loaded SrTiO3 system Reviewed

    Aufandra Cakra Wardhana, Akira Yamaguchi, Shusaku Shoji, Min Liu, Takeshi Fujita, Taro Hitosugi, Masahiro Miyauchi

    APPLIED CATALYSIS B-ENVIRONMENTAL   270   2020.8

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    DOI: 10.1016/j.apcatb.2020.118883

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  • Impact of the Crystal Orientation of Positive Electrodes on the Interface Resistance across a Solid Electrolyte and Electrode

    Kazunori Nishio, Naoto Nakamura, Koji Horiba, Miho Kitamura, Hiroshi Kumigashira, Ryota Shimizu, Taro Hitosugi

    ACS Applied Energy Materials   3 ( 7 )   6416 - 6421   2020.7

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    DOI: 10.1021/acsaem.0c00644

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  • Interfacial Superconductivity in FeSe Ultrathin Films on SrTiO3 Probed by In Situ Independently Driven Four-Point-Probe Measurements Reviewed International journal

    Asger K. Pedersen, Satoru Ichinokura, Tomoaki Tanaka, Ryota Shimizu, Taro Hitosugi, Toru Hirahara

    Physical Review Letters   124 ( 22 )   227002 - 227002   2020.6

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    We investigated the superconducting transport properties of the one-unit-cell FeSe ultrathin films epitaxially grown on undoped SrTiO_{3}(001) (STO) with a well-defined surface structure by in situ independently-driven four-point-probe measurements. Our results unambiguously revealed the detection of the two-dimensional electrical conduction of the films without parallel conduction through the underlying substrate, both in the normal and superconducting states. The monolayer film exhibited a superconducting transition at an onset temperature of 40 K. Surprisingly, the onset of superconductivity was constantly observed at 40 K even for three- and five-unit-cell-thick FeSe films, even though the normal resistivity decreased with increasing thickness. These results agree with the picture of the interfacial superconductivity, where only the FeSe/STO interface and/or the adjacent first layer of FeSe becomes superconducting while the upper layers stay in the normal metallic state. The observed T_{c} is much lower than that reported by a previous in situ transport measurement for FeSe/Nb:STO but consistent with the results obtained by ex situ measurements for FeSe-undoped STO with a capping layer. This suggests that the capping layer is not an essential factor to limit T_{c}. We rather propose that the charge transfer from the doped substrate has a key role to achieve the higher temperature superconductivity in the one-unit-cell FeSe.

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  • Superconducting dome revealed by surface structure dependence in single unit cell FeSe on SrTiO3 (001) Reviewed

    Tomoaki Tanaka, Kenta Akiyama, Satoru Ichinokura, Ryota Shimizu, Taro Hitosugi, Toru Hirahara

    PHYSICAL REVIEW B   101 ( 20 )   205421   2020.5

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    DOI: 10.1103/PhysRevB.101.205421

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  • Metal Hydrides: Epitaxial Growth and Electronic Properties Reviewed

    Ryota Shimizu, Hiroyuki Oguchi, Taro Hitosugi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   89 ( 5 )   051012 - 051012   2020.5

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    DOI: 10.7566/JPSJ.89.051012

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  • Bayesian statistics-based analysis of AC impedance spectra

    Yu Miyazaki, Ryo Nakayama, Nobuaki Yasuo, Yuki Watanabe, Ryota Shimizu, Daniel M. Packwood, Kazunori Nishio, Yasunobu Ando, Masakazu Sekijima, Taro Hitosugi

    AIP Advances   10 ( 4 )   2020.4

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    AC impedance spectroscopy is an important method for evaluating ionic, electronic, and dielectric properties of materials. In conventional analysis of AC impedance spectra, the selection of an equivalent circuit model and its initial parameters are visually determined from a Nyquist plot; this visual determination can be both inefficient and inaccurate. Thus, analysis based on a rigorous mathematical method is highly desirable. Here, we demonstrate the analysis of AC impedance spectra using Bayesian statistics. We apply the method to artificial AC impedance spectra generated from resistance (R) and capacitance (C) circuits, obtaining a high accuracy ratio (&amp;gt;90%) in model selection when the ratio of the time constants of two RC parallel circuits exceeds 3. Furthermore, this method is applied to an actual electrical circuit comprising a resistance and two RC parallel circuits, yielding highly accurate model selection and parameter estimation. The results demonstrate the effectiveness of the proposed method for AC impedance spectra.

    DOI: 10.1063/1.5143082

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  • Hole Accumulation at the Grain Boundary Enhances Water Oxidation at α-Fe<inf>2</inf>O<inf>3</inf> Electrodes under a Microwave Electric Field Reviewed

    Masayuki Matsuhisa, Shuntaro Tsubaki, Fuminao Kishimoto, Satoshi Fujii, Iku Hirano, Masahiro Horibe, Eiichi Suzuki, Ryota Shimizu, Taro Hitosugi, Yuji Wada

    Journal of Physical Chemistry C   124 ( 14 )   7749 - 7759   2020.4

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    DOI: 10.1021/acs.jpcc.9b11179

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  • Metallic band structure of CaF2 thin films grown on silicon(111): Possible formation of CaSi2 Reviewed

    Yuzuru Takahashi, Satoru Ichinokura, Ryota Shimizu, Susumu Shiraki, Taro Hitosugi, Toru Hirahara

    APPLIED SURFACE SCIENCE   509 ( 15 )   144687   2020.4

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    DOI: 10.1016/j.apsusc.2019.144687

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  • Origin of Optical Transparency in a Transparent Superconductor LiTi2O4 Reviewed

    T. Ohsawa, N. Yamada, A. Kumatani, Y. Takagi, T. Suzuki, R. Shimizu, S. Shiraki, T. Nojima, T.Hitosugi

    ACS Applied Electronic Materials   2 ( 2 )   517 - 522   2020.2

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    DOI: 10.1021/acsaelm.9b00751

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  • Low Interface Resistance in Solid-State Lithium Batteries Using Spinel LiNi0.5Mn1.5O4(111) Epitaxial Thin Films Reviewed

    Hideyuki Kawasoko, Tetsuroh Shirasawa, Susumu Shiraki, Toru Suzuki, Shigeru Kobayashi, Kazunori Nishio, Ryota Shimizu, Taro Hitosugi

    ACS Applied Energy Materials   2020.2

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    DOI: 10.1021/acsaem.9b01766

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  • Low resistance at LiNi1/3Mn1/3Co1/3O2 and Li3PO4 interfaces Reviewed

    Kazunori Nishio, Naoto Nakamura, Koji Horiba, Miho Kitamura, Hiroshi Kumigashira, Ryota Shimizu, Taro Hitosugi

    Applied Physics Letters   116 ( 5 )   2020.2

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    DOI: 10.1063/1.5133879

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  • Ultrahigh-pressure fabrication of single-phase alpha-PbO2-type TiO2 epitaxial thin films Reviewed

    Yuki Sasahara, Koki Kanatani, Hiroaki Asoma, Masayuki Matsuhisa, Kazunori Nishio, Ryota Shimizu, Norimasa Nishiyama, Taro Hitosugi

    AIP ADVANCES   10 ( 2 )   2020.2

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    DOI: 10.1063/1.5129422

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  • Low-Energy-Consumption Three-Valued Memory Device Inspired by Solid-State Batteries

    Yuki Watanabe, Shigeru Kobayashi, Issei Sugiyama, Kazunori Nishio, Wei Liu, Satoshi Watnabe, Ryota Shimizu, Taro Hitosugi

    ACS APPLIED MATERIALS & INTERFACES   11 ( 48 )   45150 - 45154   2019.12

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    DOI: 10.1021/acsami.9b15366

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  • Epitaxial Growth of Single-Phase Magnesium Dihydride Thin Films Reviewed

    Ryota Shimizu, Takuya Kakinokizono, Igseon Gu, Taro Hitosugi

    INORGANIC CHEMISTRY   58 ( 22 )   15354 - 15358   2019.11

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  • Epitaxial Film Growth of LiBH4 via Molecular Unit Evaporation Reviewed

    Oguchi Hiroyuki, Kim Sangryun, Maruyama Shingo, Horisawa Yuhei, Takagi Shigeyuki, Sato Toyoto, Shimizu Ryota, Matsumoto Yuji, Hitosugi Taro, Orimo Shin-ichi

    ACS APPLIED ELECTRONIC MATERIALS   1 ( 9 )   1792 - 1796   2019.9

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    DOI: 10.1021/acsaelm.9b00350

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  • Bottom-current-collector-free thin-film batteries using LiNi0.8Co0.2O2 epitaxial thin films Reviewed

    Nishio Kazunori, Horiba Koji, Nakamura Naoto, Kitamura Miho, Kumigashira Hiroshi, Shimizu Ryota, Hitosugi Taro

    JOURNAL OF POWER SOURCES   416   56 - 61   2019.3

  • A hysteresis loop in electrical resistance of NbHx observed above the beta-lambda transition temperature Reviewed

    Sasahara, Yuki, Shimizu, Ryota, Oguchi, Hiroyuki, Nishio, Kazunori, Ogura, Shohei, Morioka, Hitoshi, Orimo, Shin-ichi, Fukutani, Katsuyuki, Hitosugi, Taro

    AIP ADVANCES   9 ( 1 )   15027-1 - 15027-5   2019.1

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    DOI: 10.1063/1.5066367

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  • Extraordinary quasi-two-dimensional magnetotransport properties of a LaAlO3/SrTiO3 heterostructure tailored with a surface TiO2 atomic sheet Reviewed

    T. Ohsawa, R. Shimizu, K. Iwaya, S. Shiraki, T. Nojima, T. Hitosugi

    Applied Physics Letters   115   201604   2019

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  • Atomic-scale visualization of oxide thin-film surfaces Reviewed

    Katsuya Iwaya, Takeo Ohsawa, Ryota Shimizu, Yoshinori Okada, Taro Hitosugi

    Science and Technology of Advanced Materials   19 ( 1 )   282 - 290   2018.12

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    DOI: 10.1080/14686996.2018.1442616

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  • Materials informatics for self-assembly of functionalized organic precursors on metal surfaces

    Daniel M. Packwood, Taro Hitosugi

    Nature Communications   9 ( 1 )   2018.12

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    DOI: 10.1038/s41467-018-04940-z

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  • Atomically Well-Ordered Structure at Solid Electrolyte and Electrode Interface Reduces the Interfacial Resistance Reviewed

    Susumu Shiraki, Tetsuroh Shirasawa, Tohru Suzuki, Hideyuki Kawasoko, Ryota Shimizu, Taro Hitosugi

    ACS APPLIED MATERIALS & INTERFACES   10 ( 48 )   41732 - 41737   2018.12

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    DOI: 10.1021/acsami.8b08926

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  • TiO2/TNO homojunction introduced in a dye-sensitized solar cell with a novel TNO transparent conductive oxide film Reviewed

    Okuya Masayuki, Sato Jun, Endo Takeshi, Iwaki Ryo, Takemura Shuichiro, Muramoto Ryosuke, Nagygyorgy Viola, Madarasz Janos, Nakao Shoichiro, Yamada Naoomi, Sakai Enju, Hitosugi Taro, Hasegawa Tetsuya

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   101 ( 11 )   5071 - 5079   2018.11

  • Two distinct surface terminations of SrVO3 (001) ultrathin films as an influential factor on metallicity Reviewed

    Oka Hirofumi, Okada Yoshinori, Hitosugi Taro, Fukumura Tomoteru

    APPLIED PHYSICS LETTERS   113 ( 17 )   2018.10

  • LiBH4 Epitaxial Film Synthesis by Complex Anion Transfer Method to Step into an Unexplored Field of Complex Hydrides

    Oguchi Hiroyuki, Kim Sangryun, Shimizu Ryota, Hitosugi Taro, Maruyama Shingo, Matsumoto Yuji, Orimo Shin-ichi

    JSAP Annual Meetings Extended Abstracts   2018.2   1553 - 1553   2018.9

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    DOI: 10.11470/jsapmeeting.2018.2.0_1553

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  • Pulsed laser deposition of oxide thin films by the fifth harmonic of a Nd:Y3Al5O12 (Nd:YAG) laser

    Ryota Shimizu, Issei Sugiyama, Naoto Nakamura, Shigeru Kobayashi, Taro Hitosugi

    AIP ADVANCES   8 ( 9 )   2018.9

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    DOI: 10.1063/1.5048441

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  • Extremely Low Resistance of Li3PO4 Electrolyte/Li(Ni0.5Mn1.5)O4 Electrode Interfaces Reviewed

    Hideyuki Kawasoko, Susumu Shiraki, Toru Suzuki, Ryota Shimizu, Taro Hitosugi

    ACS Applied Materials & Interfaces   10 ( 32 )   27498 - 27502   2018.8

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    DOI: 10.1021/acsami.8b08506

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  • Orientation control of YH2 epitaxial thin films using reactive magnetron sputtering

    Komatsu Yuya, Shimizu Ryota, Sasahara Yuki, Nishio Kazunori, Oguchi Hiroyuki, Orimo Shin-ichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts   2018.1   1608 - 1608   2018.3

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    DOI: 10.11470/jsapmeeting.2018.1.0_1608

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  • Phase transition and electron-transport properties of NbHx (0 ≤ x < 1) epitaxial thin films

    Sasahara Yuki, Shimizu Ryota, Ogura Shohei, Nishio Kazunori, Sugiyama Issei, Oguchi Hiroyuki, Fukutani Katsuyuki, Orimo Shin-ichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts   2018.1   1606 - 1606   2018.3

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    DOI: 10.11470/jsapmeeting.2018.1.0_1606

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  • Observation of Anisotropic Band Splitting in Monolayer NbSe2: Implications for Superconductivity and Charge Density Wave Reviewed

    Y. Nakata, K. Sugawara, S. Ichinokura, Y. Okada, T. Hitosugi, T. Koretsune, S. Hasegawa, T. Sato, T. Takahashi

    npj 2D Materials and Applications   2   12   2018

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  • Impact of a surface TiO2 atomic sheet on the electronic transport properties of LaAlO3/SrTiO3 heterointerfaces Reviewed

    T. Ohsawa, M. Saito, R. Shimizu, K. Iwaya, S. Shiraki, Y. Ikuhara, T. Hitosugi

    Applied Physics Letters   113   141602   2018

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  • Li-diffusion in spinel Li[Ni1/2Mn3/2]O4 powder and film studied with m+SR Reviewed

    J. Sugiyama, H. Nozaki, I. Umegaki, K. Mukai, S. Cottrell, S. Shiraki, T. Hitosugi, Y. Sassa, A. Suter, Z. Salman, T. Prokscha, M. Mansson

    JPS Conference Proceedings   21   011015   2018

  • LE-m+SR Study of Superconductivity in the Thin Film Battery Material LiTi2O4 Reviewed

    M. Månsson, O.K. Forslund, H. Nozaki, I. Umegaki, S. Shiraki, T. Hitosugi, T. Prokscha, Z. Salman, A. Suter, Y. Sassa, J. Sugiyama

    JPS Conference Proceedings   21   011025   2018

  • Challenge for Detecting the Interface between Electrode and Electrolyte with b-NMR Reviewed

    J. Sugiyama, I. Umegaki, S. Shiraki, T. Hitosugi, R. M, L. McFadden, D. Wang, V. Karner, G. D. Morris, W. A. MacFarlane, R. F. Kiefl

    JPS Conference Proceedings   21   011021   2018

  • On the Use of 31Mg for b-Detected NMR Studies of Solids Reviewed

    R. M, L. McFadden, A. Chatzichristos, M. H. Dehn, D. Fujimoto, H. Funakubo, A. Gottberg, T. Hitosugi, V. L. Karner, R. F. Kiefl, M. Kurokawa, J. Lassen, C. D. Philip Levy, R. Li, G. D. Morris, M. R. Pearson, S. Shiraki, M. Stachura, J. Sugiyama, D. M. Szunyogh, W. A. MacFarlane

    JPS Conference Proceedings   21   011407   2018

  • Atomic-scale visualization of oxide thin-film surfaces Reviewed

    Katsuya Iwaya, Takeo Ohsawa, Ryota Shimizu, Yoshinori Okada, Taro Hitosugi

    Sci. Technol. Adv. Mat.   5   1   2018

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  • A new electrode design for ambipolar injection in organic semiconductors Reviewed

    Thangavel Kanagasekaran, Hidekazu Shimotani, Ryota Shimizu, Taro Hitosugi, Katsumi Tanigaki

    NATURE COMMUNICATIONS   8   2017.10

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    DOI: 10.1038/s41467-017-01047-9

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  • Transparent magnetic semiconductor with embedded metallic glass nano-granules Reviewed

    Na Chen, Hongping Li, Akihiko Hirata, Zhaochu Luo, Zhongchang Wang, Wenjian Liu, Bin Cui, Taro Hitosugi, Lin Gu, Xiaozhong Zhang, Xianmin Zhang, Cheng Song, Xiangrong Wang, Lijuan Zhang, Jiefeng Cao, Kazuyo Ohmura, Sergey V. Ketov, Kefu Yao, Mingwei Chen, Dmitri V. Louzguine-Luzgin

    MATERIALS & DESIGN   132   208 - 214   2017.10

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    DOI: 10.1016/j.matdes.2017.07.010

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  • Lithium diffusion in spinel Li4Ti5O12 and LiTi2O4 films detected with Li-8 beta-NMR Reviewed

    Jun Sugiyama, Izumi Umegaki, Takeshi Uyama, Ryan M. L. McFadden, Susumu Shiraki, Taro Hitosugi, Zaher Salman, Hassan Saadaoui, Gerald D. Morris, W. Andrew MacFarlane, Robert F. Kiefl

    PHYSICAL REVIEW B   96 ( 9 )   2017.9

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    DOI: 10.1103/PhysRevB.96.094402

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  • Fabrication of atomically abrupt interfaces of single-phase TiH2 and Al2O3 Reviewed

    Ryota Shimizu, Yuki Sasahara, Hiroyuki Oguchi, Kuniko Yamamoto, Issei Sugiyama, Susumu Shiraki, Shin-ichi Orimo, Taro Hitosugi

    APL MATERIALS   5 ( 8 )   2017.8

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    DOI: 10.1063/1.4996984

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  • Quasiparticle Interference on Cubic Perovskite Oxide Surfaces Reviewed

    Yoshinori Okada, Shiue-Yuan Shiau, Tay-Rong Chang, Guoqing Chang, Masaki Kobayashi, Ryota Shimizu, Horng-Tay Jeng, Susumu Shiraki, Hiroshi Kumigashira, Arun Bansil, Hsin Lin, Taro Hitosugi

    PHYSICAL REVIEW LETTERS   119 ( 8 )   2017.8

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    DOI: 10.1103/PhysRevLett.119.086801

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  • Scanning tunnelling spectroscopy of superconductivity on surfaces of LiTi2O4(111) thin films Reviewed

    Yoshinori Okada, Yasunobu Ando, Ryota Shimizu, Emi Minamitani, Susumu Shiraki, Satoshi Watanabe, Taro Hitosugi

    NATURE COMMUNICATIONS   8   2017.7

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    DOI: 10.1038/ncomms15975

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  • Rapid prediction of molecule arrangements on metal surfaces via Bayesian optimization Reviewed

    Daniel M. Packwood, Taro Hitosugi

    APPLIED PHYSICS EXPRESS   10 ( 6 )   2017.6

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    DOI: 10.7567/APEX.10.065502

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  • A nonvolatile memory device with very low power consumption based on the switching of a standard electrode potential Reviewed

    Issei Sugiyama, Ryota Shimizu, Tohru Suzuki, Kuniko Yamamoto, Hideyuki Kawasoko, Susumu Shiraki, Taro Hitosugi

    APL MATERIALS   5 ( 4 )   2017.4

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    DOI: 10.1063/1.4980031

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  • Chemical and entropic control on the molecular self-assembly process Reviewed

    Daniel M. Packwood, Patrick Han, Taro Hitosugi

    NATURE COMMUNICATIONS   8   2017.2

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    DOI: 10.1038/ncomms14463

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  • Self-assembly of very-low height/width aspect-ratio Li3Ni2NbO6 disks embedded in Li3NbO4 epitaxial films Reviewed

    Hideyuki Kawasoko, Ryota Shimizu, Yoshitaka Takagi, Kuniko Yamamoto, Issei Sugiyama, Susumu Shiraki, Taro Hitosugi

    THIN SOLID FILMS   621   202 - 206   2017.1

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    DOI: 10.1016/j.tsf.2016.12.006

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  • Monolayer 1 T-NbSe2 as a Mott insulator Reviewed

    Yuki Nakata, Katsuaki Sugawara, Ryota Shimizu, Yoshinori Okada, Patrick Han, Taro Hitosugi, Keiji Ueno, Takafumi Sato, Takashi Takahashi

    NPG ASIA MATERIALS   8   2016.11

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    DOI: 10.1038/am.2016.157

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  • Li diffusion in (110)-oriented LiCoO2 thin films grown on Au and Pt (110) substrates Reviewed

    Susumu Shiraki, Hideki Oki, Taro Hitosugi

    SURFACE AND INTERFACE ANALYSIS   48 ( 11 )   1240 - 1243   2016.11

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    DOI: 10.1002/sia.6108

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  • Transparent conducting properties of Re-doped beta-MoO3 films Reviewed

    Kuniko Yamamoto, Ryota Shimizu, Susumu Shiraki, Taro Hitosugi

    APL MATERIALS   4 ( 9 )   2016.9

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    DOI: 10.1063/1.4963154

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  • Vibrational-Electrical Properties Relationship in Donor-Doped TiO2 by Raman Spectroscopy Reviewed

    P. Mazzolini, V. Russo, C. S. Casari, T. Hitosugi, S. Nakao, T. Hasegawa, A. Li Bassi

    Journal of Physical Chemistry C   120 ( 33 )   18878 - 18886   2016.8

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    DOI: 10.1021/acs.jpcc.6b05282

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  • State-space reduction and equivalence class sampling for a molecular self-assembly model Reviewed

    Daniel M. Packwood, Patrick Han, Taro Hitosugi

    ROYAL SOCIETY OPEN SCIENCE   3 ( 7 )   2016.7

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    DOI: 10.1098/rsos.150681

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  • Negligible Sr segregation on SrTiO3(001)-(root 13x root 13)-R33.7 degrees reconstructed surfaces Reviewed

    Takeo Ohsawa, Ryota Shimizu, Katsuya Iwaya, Susumu Shiraki, Taro Hitosugi

    APPLIED PHYSICS LETTERS   108 ( 16 )   2016.4

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    DOI: 10.1063/1.4947441

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  • Orientation control of LiCoO2 epitaxial thin films on metal substrates Reviewed

    Susumu Shiraki, Yoshitaka Takagi, Ryota Shimizu, Tohru Suzuki, Masakazu Haruta, Yukio Sato, Yuichi Ikuhara, Taro Hitosugi

    THIN SOLID FILMS   600   175 - 178   2016.2

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    DOI: 10.1016/j.tsf.2016.01.032

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  • Preparation and in-situ characterization of well-defined solid electrolyte/electrode interfaces in thin-film lithium batteries Reviewed

    Masakazu Haruta, Susumu Shiraki, Takeo Ohsawa, Tohru Suzuki, Akichika Kumatani, Yoshitaka Takagi, Ryota Shimizu, Taro Hitosugi

    SOLID STATE IONICS   285   118 - 121   2016.2

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    DOI: 10.1016/j.ssi.2015.06.007

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  • Unconventional Charge-Density-Wave Transition in Monolayer 1T-TiSe2 Reviewed

    Katsuaki Sugawara, Yuki Nakata, Ryota Shimizu, Patrick Han, Taro Hitosugi, Takafumi Sato, Takashi Takahashi

    ACS NANO   10 ( 1 )   1341 - 1345   2016.1

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    DOI: 10.1021/acsnano.5b06727

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  • Self-Assembly Strategy for Fabricating Connected Graphene Nanoribbons Reviewed

    Patrick Han, Kazuto Akagi, Filippo Federici Canova, Ryota Shimizu, Hiroyuki Oguchi, Susumu Shiraki, Paul S. Weiss, Naoki Asao, Taro Hitosugi

    ACS NANO   9 ( 12 )   12035 - 12044   2015.12

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    DOI: 10.1021/acsnano.5b04879

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  • Low-temperature deposition of meta-stable beta-MoO3(011) epitaxial thin films using step-and-terrace substrates Reviewed

    Ryota Shimizu, Kuniko Yamamoto, Tohru Suzuki, Takeo Ohsawa, Susumu Shiraki, Taro Hitosugi

    THIN SOLID FILMS   595   153 - 156   2015.11

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    DOI: 10.1016/j.tsf.2015.10.066

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  • Pulsed laser deposition of air-sensitive hydride epitaxial thin films: LiH Reviewed

    Hiroyuki Oguchi, Shigehito Isobe, Hiroki Kuwano, Susumu Shiraki, Shin-ichi Orimo, Taro Hitosugi

    APL MATERIALS   3 ( 9 )   2015.9

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    DOI: 10.1063/1.4931080

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  • A Single-Atom-Thick TiO2 Nanomesh on an Insulating Oxide Reviewed

    Takeo Ohsawa, Mitsuhiro Saito, Ikutaro Hamada, Ryota Shimizu, Katsuya Iwaya, Susumu Shiraki, Zhongchang Wang, Yuichi Ikuhara, Taro Hitosugi

    ACS NANO   9 ( 9 )   8766 - 8772   2015.9

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    DOI: 10.1021/acsnano.5b02867

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  • Current Response at Grain and Grain Boundaries in LiFePO4 Thin Films By Nano-Scanning Electrochemical Cell Microscopy

    Akichika Kumatani, Yasufumi Takahashi, Hirotaka Inomata, Tetsuya Watanabe, Kuniko Yamamoto, Masakazu Haruta, Susumu Shiraki, Hitoshi Shiku, Taro Hitosugi, Tomokazu Matsue

    ECS Meeting Abstracts   {MA}2015-02 ( 1 )   88 - 88   2015.7

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    <jats:p>Creation of high performance electrodes in rechargeable lithium-ion batteries (LIBs) is one of urgent demand to store unused energy towards low-carbon emission society. To satisfy this demand, a facile characterization technique is required for analyzing electrochemical response related to lithium-ion transport via crystal orientation or crystal boundaries in the electrodes. Recently, we have developed a single-channel nano-scanning electrochemical call microscopy (nanoSECCM).<jats:sup>1</jats:sup> The nanoSECCM can obtain current response related to ion transport only as <jats:italic>in-situ </jats:italic>measurement with nanometer resolution. In this study, we have applied nanoSECCM to characterize the current repose at grain and grain boundaries on the LiFePO<jats:sub>4</jats:sub> thin film electrode. The film is multi-domain structure with sub-micrometer grains including [010] crystal orientation, confirmed by SEM and XRD analyses. The inhomogeneity of the response at grains was visualized from nanoSECCM mapping. The response at particular grain with higher response presumably indicates that it possesses [010] crystal orientation which is known as higher current response in LiFePO<jats:sub>4</jats:sub>.<jats:sup>2</jats:sup> We show that this analysis is a sensitive and facile measure of the influence for crystal orientation and boundaries in electrodes of LIBs. </jats:p>
    <jats:p>[1] Y. Takahashi, A. Kumatani <jats:italic>et al</jats:italic>., Nat. Communi. <jats:bold>5</jats:bold>:5450 (2014).</jats:p>
    <jats:p>[2] D. Morgan <jats:italic>et a</jats:italic>l., Electrochem. Solid State Lett. <jats:bold>7</jats:bold>, A30 (2004).</jats:p>

    DOI: 10.1149/ma2015-02/1/88

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  • Li-ion diffusion in Li4Ti5O12 and LiTi2O4 battery materials detected by muon spin spectroscopy Reviewed

    Jun Sugiyama, Hiroshi Nozaki, Izumi Umegaki, Kazuhiko Mukai, Kazutoshi Miwa, Susumu Shiraki, Taro Hitosugi, Andreas Suter, Thomas Prokscha, Zaher Salman, James S. Lord, Martin Mansson

    PHYSICAL REVIEW B   92 ( 1 )   2015.7

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    DOI: 10.1103/PhysRevB.92.014417

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  • Charge-Density Wave in Ca-Intercalated Bilayer Graphene Induced by Commensurate Lattice Matching Reviewed

    Ryota Shimizu, Katsuaki Sugawara, Kohei Kanetani, Katsuya Iwaya, Takafumi Sato, Takashi Takahashi, Taro Hitosugi

    PHYSICAL REVIEW LETTERS   114 ( 14 )   2015.4

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    DOI: 10.1103/PhysRevLett.114.146103

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  • Reply to "Comment on 'Bottom-Up Graphene-Nanoribbon Fabrication Reveals Chiral Edges and Enantio selectivity'" Reviewed

    Patrick Han, Kazuto Akagi, Filippo Federici Canova, Hirotaka Mutoh, Susumu Shiraki, Katsuya Iwaya, Paul S. Weiss, Naoki Asao, Taro Hitosugi

    ACS NANO   9 ( 4 )   3404 - 3405   2015.4

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  • Graphene integration by molecular assembly Reviewed

    Patrick Han, Kazuto Akagi, Filippo Federici Canova, Hirotaka Mutoh, Susumu Shiraki, Katsuya Iwaya, Paul Weiss, Naoki Asao, Taro Hitosugi

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   249   2015.3

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  • Negligible "Negative Space-Charge Layer Effects" at Oxide-Electrolyte/Electrode Interfaces of Thin-Film Batteries Reviewed

    Masakazu Haruta, Susumu Shiraki, Tohru Suzuki, Akichika Kumatani, Takeo Ohsawa, Yoshitaka Takagi, Ryota Shimizu, Taro Hitosugi

    NANO LETTERS   15 ( 3 )   1498 - 1502   2015.3

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    DOI: 10.1021/nl5035896

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  • Direct Observation of Dirac Cone in Multilayer Silicene Intercalation Compound CaSi2 Reviewed

    Eiichi Noguchi, Katsuaki Sugawara, Ritsuko Yaokawa, Taro Hitosugi, Hideyuki Nakano, Takashi Takahashi

    ADVANCED MATERIALS   27 ( 5 )   856 - 860   2015.2

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    DOI: 10.1002/adma.201403077

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  • Direct Visualization of Atomic and Electronic Structure on Perovskite Oxide Film Surface Reviewed

    Takeo Ohsawa, Katsuya Iwaya, Yoshinori Okada, Ryota Shimizu, Susumu Shiraki, Taro Hitosugi

    OXIDE-BASED MATERIALS AND DEVICES VI   9364   2015

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    DOI: 10.1117/12.2079469

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  • Imaging the Evolution of d States at a Strontium Titanate Surface Reviewed

    Ikutaro Hamada, Ryota Shimizu, Takeo Ohsawa, Katsuya Iwaya, Tomihiro Hashizume, Masaru Tsukada, Kazuto Akagi, Taro Hitosugi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   136 ( 49 )   17201 - 17206   2014.12

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    DOI: 10.1021/ja509231w

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  • Fabrication of all-solid-state battery using epitaxial Li CoO2 thin films Reviewed

    Susumu Shiraki, Hideki Oki, Yoshitaka Takagi, Tohru Suzuki, Akichika Kumatani, Ryota Shimizu, Masakazu Haruta, Takeo Ohsawa, Yukio Sato, Yuichi Ikuhara, Taro Hitosugi

    JOURNAL OF POWER SOURCES   267   881 - 887   2014.12

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    DOI: 10.1016/j.jpowsour.2014.05.133

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  • Epitaxial thin film growth of LiH using a liquid-Li atomic template Reviewed

    Hiroyuki Oguchi, Tamio Ikeshoji, Takeo Ohsawa, Susumu Shiraki, Hiroki Kuwano, Shin-ichi Orimo, Taro Hitosugi

    APPLIED PHYSICS LETTERS   105 ( 21 )   2014.11

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    DOI: 10.1063/1.4902446

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  • Scanning Tunneling Microscopy/Spectroscopy on Perovskite Oxide Thin Films Deposited In Situ Reviewed

    Taro Hitosugi, Ryota Shimizu, Takeo Ohsawa, Katsuya Iwaya

    CHEMICAL RECORD   14 ( 5 )   935 - 943   2014.10

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    DOI: 10.1002/tcr.201402041

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  • Nanoepitaxy of Anatase-type TiO2 on CeO2 Nanocubes Self-Assembled on a Si Substrate for Fabricating Well-Aligned Nanoscale Heterogeneous Interfaces Reviewed

    Daisuke Hojo, Takanari Togashi, Takeo Ohsawa, Mitsuhiro Saito, Zhongchang Wang, Yusuke Sakuda, Shunsuke Asahina, Yuichi Ikuhara, Taro Hitosugi, Tadafumi Adschiri

    CRYSTAL GROWTH & DESIGN   14 ( 9 )   4714 - 4720   2014.9

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    DOI: 10.1021/cg500821z

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  • Bottom-Up Graphene-Nanoribbon Fabrication Reveals Chiral Edges and Enantioselectivity Reviewed

    Patrick Han, Kazuto Akagi, Filippo Federici Canova, Hirotaka Mutoh, Susumu Shiraki, Katsuya Iwaya, Paul S. Weiss, Naoki Asao, Taro Hitosugi

    ACS NANO   8 ( 9 )   9181 - 9187   2014.9

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    DOI: 10.1021/nn5028642

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  • Graphene dots fabrication by a bio-template and a neutral beam etching Reviewed

    Koki Igarashi, Takeru Okada, Patrick Han, Katsuaki Sugawara, Taro Hitosugi, Seiji Samukawa

    The 6th IEEE International Nanoelectronics Conference 2014   2014.7

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  • Epitaxial growth of Li4Ti5O12 thin films using RF magnetron sputtering Reviewed

    Akichika Kumatani, Susumu Shiraki, Yoshitaka Takagi, Tohru Suzuki, Takeo Ohsawa, Xiang Gao, Yuichi Ikuhara, Taro Hitosugi

    JAPANESE JOURNAL OF APPLIED PHYSICS   53 ( 5 )   2014.5

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    DOI: 10.7567/JJAP.53.058001

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  • Epitaxial growth of Li

    Kumatani Akichika, Shiraki Susumu, Takagi Yoshitaka, Suzuki Tohru, Ohsawa Takeo, Gao Xiang, Ikuhara Yuichi, Hitosugi Taro

    Jpn. J. Appl. Phys.   53 ( 5 )   58001 - 58001   2014.4

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    DOI: 10.7567/JJAP.53.058001

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  • Epitaxial Growth Process of La0.7Ca0.3MnO3 Thin Films on SrTiO3(001): Thickness-Dependent Inhomogeneity Caused by Excess Ti Atoms Reviewed

    Ryota Shimizu, Takeo Ohsawa, Katsuya Iwaya, Susumu Shiraki, Taro Hitosugi

    CRYSTAL GROWTH & DESIGN   14 ( 4 )   1555 - 1560   2014.4

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    DOI: 10.1021/cg4013119

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  • Visualizing Atomistic Formation Process of SrOx Thin Films on SrTiO3 Reviewed

    Takeo Ohsawa, Ryota Shimizu, Katsuya Iwaya, Taro Hitosugi

    ACS NANO   8 ( 3 )   2223 - 2229   2014.3

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    DOI: 10.1021/nn405359u

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  • Atomic-scale investigations of perovskite oxide heteroepitaxy Reviewed

    Takeo Ohsawa, Ryota Shimizu, Katsuya Iwaya, Susumu Shiraki, Taro Hitosugi

    Journal of the Ceramic Society of Japan   122 ( 1426 )   456 - 459   2014

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    DOI: 10.2109/jcersj2.122.456

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  • 8Li β-NMR study of epitaxial LixCoO2 films Reviewed

    J. Sugiyama, M. Harada, H. Oki, S. Shiraki, T. Hitosugi, O. Ofer, Z. Salman, Q. Song, D. Wang, H. Saadaoui, G. D. Morris, K. H. Chow, W. A. Macfarlane, R. F. Kiefl

    Journal of Physics: Conference Series   551 ( 1 )   012009   2014

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    DOI: 10.1088/1742-6596/551/1/012009

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  • Atomic collision effects during the PLD processes: nonstoichiometry control in transparent superconductors Reviewed

    Taro Hitosugi, D. Packwood, S. Shiraki

    OXIDE-BASED MATERIALS AND DEVICES V   8987   2014

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    DOI: 10.1117/12.2045551

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  • Antiphase inversion domains in lithium cobaltite thin films deposited on single-crystal sapphire substrates Reviewed

    S. J. Zheng, C. A.J. Fisher, T. Hitosugi, A. Kumatani, S. Shiraki, Y. H. Ikuhara, A. Kuwabara, H. Moriwake, H. Oki, Y. Ikuhara

    Acta Materialia   61 ( 20 )   7671 - 7678   2013.12

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    DOI: 10.1016/j.actamat.2013.09.004

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  • Impact of lithium-ion ordering on surface electronic states of Li xCoO2

    K. Iwaya, T. Ogawa, T. Minato, K. Miyoshi, J. Takeuchi, A. Kuwabara, H. Moriwake, Y. Kim, T. Hitosugi

    Physical Review Letters   111 ( 12 )   2013.9

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    DOI: 10.1103/PhysRevLett111126104

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  • Wet Etching of Amorphous TiO2 Thin Films Using H3PO4-H2O2 Aqueous Solution Reviewed

    Sohei Okazaki, Takuya Ohhashi, Shoichiro Nakao, Yasushi Hirose, Taro Hitosugi, Tetsuya Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   52 ( 9 )   2013.9

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    DOI: 10.7567/JJAP.52.098002

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  • Effects of atomic collisions on the stoichiometry of thin films prepared by pulsed laser deposition Reviewed

    Daniel M. Packwood, Susumu Shiraki, Taro Hitosugi

    Physical Review Letters   111 ( 3 )   2013.7

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    DOI: 10.1103/PhysRevLett.111.036101

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  • Capability of insulator study by photoemission electron microscopy at SPring-8 Reviewed

    Takuo Ohkochi, Masato Kotsugi, Keisuke Yamada, Kenji Kawano, Koji Horiba, Fumio Kitajima, Masaki Oura, Susumu Shiraki, Taro Hitosugi, Masaharu Oshima, Teruo Ono, Toyohiko Kinoshita, Takayuki Muro, Yoshio Watanabe

    JOURNAL OF SYNCHROTRON RADIATION   20   620 - 625   2013.7

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    DOI: 10.1107/S0909049513012508

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  • First-Principles Calculations of Lithium-Ion Migration at a Coherent Grain Boundary in a Cathode Material, LiCoO2 Reviewed

    Hiroki Moriwake, Akihide Kuwabara, Craig A. J. Fisher, Rong Huang, Taro Hitosugi, Yumi H. Ikuhara, Hideki Oki, Yuichi Ikuhara

    ADVANCED MATERIALS   25 ( 4 )   618 - 622   2013.1

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    DOI: 10.1002/adma.201202805

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  • Investigation of transparent magnetic material formed by selective oxidation of a metallic glass Reviewed

    D. V. Louzguine-Luzgin, T. Hitosugi, N. Chen, S. V. Ketov, A. Shluger, V. Yu Zadorozhnyy, A. Caron, S. Gonzales, C. L. Qin, A. Inoue

    Thin Solid Films   531   471 - 475   2013

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    DOI: 10.1016/j.tsf.2013.01.006

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  • Observation of momentum space semi-localization in Si-doped β-Ga 2O3 Reviewed

    P. Richard, T. Sato, S. Souma, K. Nakayama, H. W. Liu, K. Iwaya, T. Hitosugi, H. Aida, H. Ding, T. Takahashi

    Applied Physics Letters   101 ( 23 )   2012.12

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    DOI: 10.1063/1.4769109

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  • High-temperature stability of Nb12O29 transparent conductor Reviewed

    Takeo Ohsawa, Tohru Suzuki, Taro Hitosugi

    THIN SOLID FILMS   526   218 - 220   2012.12

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    DOI: 10.1016/j.tsf.2012.11.025

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  • Ca intercalated bilayer graphene as a thinnest limit of superconducting C6Ca Reviewed

    Kohei Kanetani, Katsuaki Sugawara, Takafumi Sato, Ryota Shimizu, Katsuya Iwaya, Taro Hitosugi, Takashi Takahashi

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   109 ( 48 )   19610 - 19613   2012.11

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    DOI: 10.1073/pnas.1208889109

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  • Design of an effective vibration isolation system for measurements sensitive to low-frequency vibrations Reviewed

    Katsuya Iwaya, Ryota Shimizu, Akira Teramura, Seiji Sasaki, Toru Itagaki, Taro Hitosugi

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   30 ( 6 )   2012.11

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    DOI: 10.1116/1.4754700

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  • Fabrication of Nb-Doped TiO2 Transparent Conducting Films by Postdeposition Annealing under Nitrogen Atmosphere Reviewed

    Sohei Okazaki, Junpei Ohkubo, Shoichiro Nakao, Yasushi Hirose, Taro Hitosugi, Tetsuya Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   51 ( 11 )   2012.11

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    DOI: 10.1143/JJAP.51.118003

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  • Growth processes of lithium titanate thin films deposited by using pulsed laser deposition Reviewed

    Akichika Kumatani, Takeo Ohsawa, Ryota Shimizu, Yoshitaka Takagi, Susumu Shiraki, Taro Hitosugi

    APPLIED PHYSICS LETTERS   101 ( 12 )   2012.9

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    DOI: 10.1063/1.4752466

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  • Effect of oxygen deficiency on SrTiO3(001) surface reconstructions Reviewed

    Ryota Shimizu, Katsuya Iwaya, Takeo Ohsawa, Susumu Shiraki, Tetsuya Hasegawa, Tomihiro Hashizume, Taro Hitosugi

    APPLIED PHYSICS LETTERS   100 ( 26 )   2012.6

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    DOI: 10.1063/1.4730409

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  • Phase transitions in LiCoO2 thin films prepared by pulsed laser deposition Reviewed

    Rong Huang, Taro Hitosugi, Craig A. J. Fisher, Yumi H. Ikuhara, Hiroki Moriwake, Hideki Oki, Yuichi Ikuhara

    MATERIALS CHEMISTRY AND PHYSICS   133 ( 2-3 )   1101 - 1107   2012.4

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    DOI: 10.1016/j.matchemphys.2012.02.022

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  • A High-Coincidence Twin Boundary in Lithium Battery Material LiCoO2 Reviewed

    Craig A. J. Fisher, Rong Huang, Taro Hitosugi, Hiroki Moriwake, Akihide Kuwabara, Yumi H. Ikuhara, Hideki Oki, Yuichi Ikuhara

    NANOSCIENCE AND NANOTECHNOLOGY LETTERS   4 ( 2 )   165 - 168   2012.2

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    DOI: 10.1166/nnl.2012.1301

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  • Atomic-Scale Visualization of Initial Growth of Homoepitaxial SrTiO3 Thin Film on an Atomically Ordered Substrate Reviewed

    Ryota Shimizu, Katsuya Iwaya, Takeo Ohsawa, Susumu Shiraki, Tetsuya Hasegawa, Tomihiro Hashizume, Taro Hitosugi

    ACS NANO   5 ( 10 )   7967 - 7971   2011.10

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    DOI: 10.1021/nn202477n

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  • Systematic analyses of vibration noise of a vibration isolation system for high-resolution scanning tunneling microscopes Reviewed

    Katsuya Iwaya, Ryota Shimizu, Tomihiro Hashizume, Taro Hitosugi

    REVIEW OF SCIENTIFIC INSTRUMENTS   82 ( 8 )   2011.8

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    DOI: 10.1063/1.3622507

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  • An n-Type Transparent Conducting Oxide: Nb12O29 Reviewed

    Takeo Ohsawa, Junpei Okubo, Tohru Suzuki, Hiroshi Kumigashira, Masaharu Oshima, Taro Hitosugi

    JOURNAL OF PHYSICAL CHEMISTRY C   115 ( 33 )   16625 - 16629   2011.8

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    DOI: 10.1021/jp203021u

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  • Atomically resolved silicon donor states of β-Ga2O 3 Reviewed

    K. Iwaya, R. Shimizu, H. Aida, T. Hashizume, T. Hitosugi

    Applied Physics Letters   98 ( 14 )   2011.4

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    DOI: 10.1063/1.3578195

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  • Enhanced Carrier Transport in Uniaxially (001)-Oriented Anatase Ti0.94Nb0.06O2 Films Grown on Nanosheet Seed Layers Reviewed

    Naoomi Yamada, Tatsuo Shibata, Kenji Taira, Yasushi Hirose, Shoichiro Nakao, Ngoc Lam Huong Hoang, Taro Hitosugi, Toshihiro Shimada, Takayoshi Sasaki, Tetsuya Hasegawa

    APPLIED PHYSICS EXPRESS   4 ( 4 )   2011.4

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    DOI: 10.1143/APEX.4.045801

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  • Simplified method to prepare atomically-ordered TiO2(1 1 0)-(1 x 1) surfaces with steps and terraces Reviewed

    Ryota Shimizu, Katsuya Iwaya, Takeo Ohsawa, Tetsuya Hasegawa, Tomihiro Hashizume, Taro Hitosugi

    APPLIED SURFACE SCIENCE   257 ( 11 )   4867 - 4869   2011.3

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    DOI: 10.1016/j.apsusc.2010.12.127

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  • Stripe charge ordering in SrO-terminated SrTiO3(001) surfaces Reviewed

    Katsuya Iwaya, Ryota Shimizu, Takeo Ohsawa, Tomihiro Hashizume, Taro Hitosugi

    PHYSICAL REVIEW B   83 ( 12 )   2011.3

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    DOI: 10.1103/PhysRevB.83.125117

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  • Real-time direct observation of Li in LiCoO2 cathode material Reviewed

    Rong Huang, Taro Hitosugi, Scott D. Findlay, Craig A. J. Fisher, Yumi H. Ikuhara, Hiroki Moriwake, Hideki Oki, Yuichi Ikuhara

    APPLIED PHYSICS LETTERS   98 ( 5 )   2011.1

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    DOI: 10.1063/1.3551538

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  • Wet Etching of TiO2-Based Precursor Amorphous Films for Transparent Electrodes Reviewed

    Junpei Ohkubo, Yasushi Hirose, Enju Sakai, Shoichiro Nakao, Taro Hitosugi, Tetsuya Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   50 ( 1 )   2011.1

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    DOI: 10.1143/JJAP.50.018002

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  • Fabrication of transparent conductive W-doped SnO2 thin films on glass substrates using anatase TiO2 seed layers Reviewed

    Shoichiro Nakao, Naoomi Yamada, Taro Hitosugi, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

    PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 2   8 ( 2 )   2011

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    DOI: 10.1002/pssc.201000505

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  • Thickness-dependent local surface electronic structures of homoepitaxial SrTiO3 thin films Reviewed

    T. Ohsawa, K. Iwaya, R. Shimizu, T. Hashizume, T. Hitosugi

    Journal of Applied Physics   108 ( 7 )   2010.10

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    DOI: 10.1063/1.3485826

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  • Valence evaluation of LiMnO2 and related battery materials by x-ray absorption spectroscopy Reviewed

    H. Wadati, D. G. Hawthorn, T. Z. Regier, G. Chen, T. Hitosugi, T. Mizokawa, A. Tanaka, G. A. Sawatzky

    Applied Physics Letters   97 ( 2 )   2010.7

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    DOI: 10.1063/1.3463468

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  • Properties of TiO2-based transparent conducting oxides Reviewed

    Taro Hitosugi, Naoomi Yamada, Shoichiro Nakao, Yasushi Hirose, Tetsuya Hasegawa

    PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE   207 ( 7 )   1529 - 1537   2010.7

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    DOI: 10.1002/pssa.200983774

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  • Pentacene growth on graphite investigated by low-energy electron microscope Reviewed

    H. W. Liu, A. Al-Mahboob, Y. Fujikawa, N. Fukui, T. Hitosugi, T. Hashizume, Q. K. Xue, T. Sakurai

    Journal of Crystal Growth   312 ( 7 )   967 - 970   2010.3

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    DOI: 10.1016/j.jcrysgro.2009.12.066

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  • Fabrication of highly conductive Ta-doped SnO2 polycrystalline films on glass using seed-layer technique by pulse laser deposition Reviewed

    Shoichiro Nakao, Naoomi Yamada, Taro Hitosugi, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

    THIN SOLID FILMS   518 ( 11 )   3093 - 3096   2010.3

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    DOI: 10.1016/j.tsf.2009.09.187

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  • Transparent conducting Nb-doped anatase TiO2 (TNO) thin films sputtered from various oxide targets Reviewed

    Naoomi Yamada, Taro Hitosugi, Junpei Kasai, Ngoc Lam Huong Hoang, Shoichiro Nakao, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

    THIN SOLID FILMS   518 ( 11 )   3101 - 3104   2010.3

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    DOI: 10.1016/j.tsf.2009.07.205

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  • Properties of TiO2-based transparent conducting oxide thin films on GaN(0001) surfaces Reviewed

    J. Kasai, T. Hitosugi, M. Moriyama, K. Goshonoo, N. L. H. Hoang, S. Nakao, N. Yamada, T. Hasegawa

    JOURNAL OF APPLIED PHYSICS   107 ( 5 )   2010.3

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    DOI: 10.1063/1.3326943

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  • Transport properties and electronic states of anatase Ti1-xWxO2 epitaxial thin films Reviewed

    Utahito Takeuchi, Akira Chikamatsu, Taro Hitosugi, Hiroshi Kumigashira, Masaharu Oshima, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

    JOURNAL OF APPLIED PHYSICS   107 ( 2 )   2010.1

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    DOI: 10.1063/1.3277057

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  • Sputter Deposition of High-Mobility Sn1-xTaxO2 Films on Anatase-TiO2-Coated Glass Reviewed

    Naoomi Yamada, Shoichiro Nakao, Taro Hitosugi, Tetsuya Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 10 )   2010

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    DOI: 10.1143/JJAP.49.108002

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  • Atomically Resolved Surface Structure of SrTiO3(001) Thin Films Grown in Step-Flow Mode by Pulsed Laser Deposition Reviewed

    Katsuya Iwaya, Takeo Ohsawa, Ryota Shimizu, Tomihiro Hashizume, Taro Hitosugi

    APPLIED PHYSICS EXPRESS   3 ( 7 )   2010

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    DOI: 10.1143/APEX.3.075701

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  • High Mobility Exceeding 80 cm(2) V-1 s(-1) in Polycrystalline Ta-Doped SnO2 Thin Films on Glass Using Anatase TiO2 Seed Layers Reviewed

    Shoichiro Nakao, Naoomi Yamada, Taro Hitosugi, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

    APPLIED PHYSICS EXPRESS   3 ( 3 )   2010

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    DOI: 10.1143/APEX.3.031102

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  • Preparation of Superconducting Niobium Tips for Atomic-Resolution Scanning Tunneling Microscopy/Spectroscopy Reviewed

    Ryota Shimizu, Taro Hitosugi, Tomihiro Hashizume, Noritaka Fukuo, Tetsuya Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 2 )   2010

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    DOI: 10.1143/JJAP.49.028004

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  • Carrier Compensation by Excess Oxygen Atoms in Anatase Ti0.94Nb0.06O2+delta Epitaxial Thin Films Reviewed

    Hiroyuki Nogawa, Taro Hitosugi, Akira Chikamatsu, Shoichiro Nakao, Yasushi Hirose, Toshihiro Shimada, Hiroshi Kumigashira, Masaharu Oshima, Tetsuya Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 4 )   2010

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    DOI: 10.1143/JJAP.49.041102

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  • Preparation of Atomically Flat TiO2(110) Substrate Reviewed

    Ryota Shimizu, Taro Hitosugi, Koji S. Nakayama, Toshio Sakurai, Manabu Shiraiwa, Tetsuya Hasegawa, Tomihiro Hashizume

    JAPANESE JOURNAL OF APPLIED PHYSICS   48 ( 12 )   2009.12

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    DOI: 10.1143/JJAP.48.125506

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  • Fabrication of EuTiO3 Epitaxial Thin Films by Pulsed Laser Deposition Reviewed

    Kunitada Hatabayashi, Taro Hitosugi, Yasushi Hirose, Xianqiang Cheng, Toshihiro Shimada, Tetsuya Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   48 ( 10 )   2009.10

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    DOI: 10.1143/JJAP.48.100208

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  • Superconductor-insulator phase transition in single-crystal La2-x Srx CuO4 films grown by the liquid-phase epitaxy method Reviewed

    A. T. M. Nazmul Islam, T. Hitosugi, E. Dudzik, T. Hasegawa, S. Ueda, Y. Takano, F. N. Islam, M. K.R. Khan, M. N. Islam, A. K.M.A. Islam, S. Watauchi, I. Tanaka

    Physical Review B - Condensed Matter and Materials Physics   80 ( 2 )   2009.8

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    DOI: 10.1103/PhysRevB.80.024505

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  • Preparation of Layered-Rhombohedral LiCoO2 Epitaxial Thin Films Using Pulsed Laser Deposition Reviewed

    Tetsukazu Tsuruhama, Taro Hitosugi, Hideki Oki, Yasushi Hirose, Tetsuya Hasegawa

    APPLIED PHYSICS EXPRESS   2 ( 8 )   2009.8

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    DOI: 10.1143/APEX.2.085502

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  • Density functional theory based first-principle calculation of Nb-doped anatase TiO2 and its interactions with oxygen vacancies and interstitial oxygen Reviewed

    Hideyuki Kamisaka, Taro Hitosugi, Takahiro Suenaga, Tetsuya Hasegawa, Koichi Yamashita

    JOURNAL OF CHEMICAL PHYSICS   131 ( 3 )   2009.7

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    DOI: 10.1063/1.3157283

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  • Direct growth of transparent conducting Nb-doped anatase TiO2 polycrystalline films on glass Reviewed

    Naoomi Yamada, Taro Hitosugi, Junpei Kasai, Ngoc Lam Huong Hoang, Shoichiro Nakao, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

    JOURNAL OF APPLIED PHYSICS   105 ( 12 )   2009.6

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    DOI: 10.1063/1.3148267

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  • Large electron mass anisotropy in a d-electron-based transparent conducting oxide: Nb-doped anatase TiO2 epitaxial films Reviewed

    Yasushi Hirose, Naoomi Yamada, Shoichiro Nakao, Taro Hitosugi, Toshihiro Shimada, Tetsuya Hasegawa

    PHYSICAL REVIEW B   79 ( 16 )   2009.4

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    DOI: 10.1103/PhysRevB.79.165108

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  • Fabrication of TiO2-based transparent conducting oxide on glass and polyimide substrates Reviewed

    T. Hitosugi, N. Yamada, N. L. H. Hoang, J. Kasai, S. Nakao, T. Shimada, T. Hasegawa

    THIN SOLID FILMS   517 ( 10 )   3106 - 3109   2009.3

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    DOI: 10.1016/j.tsf.2008.11.090

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  • Large electron mass anisotropy in anatase Ti1-xNb xO2 transparent conductor Reviewed

    Hirose Y, Yamada N, Nakao S, Hitosugi T, Shimada T, Konuma S, Hasegawa T

    Materials Research Society Symposium Proceedings   1109   86 - 91   2009

  • Growth of transparent conducting Nb-doped anatase TiO2 thin films on glass using seed layers Reviewed

    Yamada N, Hitosugi T, Nakao S, Kasai J, Hirose Y, Hoang N.L.H, Shimada T, Hasegawa T

    Materials Research Society Symposium Proceedings   1109   15 - 24   2009

  • Low-temperature fabrication of transparent conducting polycrystalline Nb-doped TiO2 films by sputtering Reviewed

    Hoang N.L.H, Yamada N, Hitosugi T, Kasai J, Nakao S, Shimada T, Hasegawa T

    Materials Research Society Symposium Proceedings   1109   25 - 30   2009

  • Low-temperature Fabrication of Transparent Conducting Anatase Nb-doped TiO2 Films by Sputtering Reviewed

    Ngoc Lam Huong Hoang, Naoomi Yamada, Taro Hitosugi, Junpei Kasai, Shoichiro Nakao, Toshihiro Shimada, Tetsuya Hasegawa

    APPLIED PHYSICS EXPRESS   1 ( 11 )   2008.11

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    DOI: 10.1143/APEX.1.115001

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  • Electronic Band Structure of Transparent Conductor: Nb-Doped Anatase TiO2 Reviewed

    Taro Hitosugi, Hideyuki Kamisaka, Koichi Yamashita, Hiroyuki Nogawa, Yutaka Furubayashi, Shoichiro Nakao, Naoomi Yamada, Akira Chikamatsu, Hiroshi Kumigashira, Masaharu Oshima, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

    APPLIED PHYSICS EXPRESS   1 ( 11 )   2008.11

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    DOI: 10.1143/APEX.1.111203

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  • Transparent conducting properties of anatase Ti0.94Nb0.06O2 polycrystalline films on glass substrate Reviewed

    T. Hitosugi, A. Ueda, S. Nakao, N. Yamada, Y. Furubayashi, Y. Hirose, S. Konuma, T. Shimada, T. Hasegawa

    Thin Solid Films   516 ( 17 )   5750 - 5753   2008.7

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    DOI: 10.1016/j.tsf.2007.10.028

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  • Structural, electrical and optical propel-ties of sputter-deposited Nb-doped TiO2 (TNO) polycrystalline films Reviewed

    Naoomi Yamada, Taro Hitosugi, Ngoc Lam Huong Hoang, Yutaka Furubayashi, Yasushi Hirose, Seiji Konuma, Toshihiro Shimada, Tetsuya Hasegawa

    THIN SOLID FILMS   516 ( 17 )   5754 - 5757   2008.7

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    DOI: 10.1016/j.tsf.2007.10.036

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  • One unit-cell seed layer induced epitaxial growth of heavily nitrogen doped anatase TiO2 films Reviewed

    T. L. Chen, Y. Hirose, T. Hitosugi, T. Hasegawa

    Journal of Physics D: Applied Physics   41 ( 6 )   2008.3

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    DOI: 10.1088/0022-3727/41/6/062005

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  • Magnetotransport properties of Fe/pentacene/Co : TiO2 junctions with Fe top contact electrodes prepared by thermal evaporation and pulsed laser deposition Reviewed

    Toshihiro Shimada, Hiroyuki Nogawa, Takuya Noguchi, Yutaka Furubayashi, Yukio Yamamoto, Yasushi Hirose, Taro Hitosugi, Tetsuya Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 2 )   1184 - 1187   2008.2

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    DOI: 10.1143/JJAP.47.1184

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  • Heteroepitaxial growth of ferromagnetic rutile CoxTi1-xO2-delta on GaN(0001) Reviewed

    Yasushi Hirose, Taro Hitosugi, Junpei Kasai, Yutaka Furubayashi, Kiyomi Nakajima, Toyohiro Chikyow, Seiji Konuma, Toshihiro Shimada, Tetsuya Hasegawa

    APPLIED PHYSICS LETTERS   92 ( 4 )   2008.1

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    DOI: 10.1063/1.2838297

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  • Formation mechanism of one-dimensional Si islands on a H/Si(001) surface Reviewed

    Jun Nara, Hiroshi Kajiyama, Tomihiro Hashizume, Yuji Suwa, Seiji Heike, Shinobu Matsuura, Taro Hitosugi, Takahisa Ohno

    PHYSICAL REVIEW LETTERS   100 ( 2 )   2008.1

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    DOI: 10.1103/PhysRevLett.100.026102

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  • Structural study of Ti O2 -based transparent conducting films Reviewed

    T. Hitosugi, N. Yamada, S. Nakao, K. Hatabayashi, T. Shimada, T. Hasegawa

    Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films   26 ( 4 )   1027 - 1029   2008

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    DOI: 10.1116/1.2944260

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  • Ferromagnetic rutile CoxTi1-xO2-delta heteroepitaxy on wurtzite GaN and ZnO Reviewed

    Yasushi Hirose, Taro Hitosugi, Junpei Kasai, Yutaka Furubayashi, Kiyomi Nakajima, Toyohiro Chikyow, Seiji Konuma, Toshihiro Shimada, Tetsuya Hasegawa

    PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 5, NO 9   5 ( 9 )   3104 - +   2008

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    DOI: 10.1002/pssc.200779251

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  • Quantitative analysis of thin-film conductivity by scanning microwave microscope Reviewed

    Sohei Okazaki, Noriaki Okazaki, Yasushi Hirose, Yutaka Furubayashi, Taro Hitosugi, Toshihiro Shimada, Tetsuya Hasegawa

    APPLIED SURFACE SCIENCE   254 ( 3 )   757 - 759   2007.11

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    DOI: 10.1016/j.apsusc.2007.06.076

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  • Anatase phase stability and doping concentration dependent refractivity in codoped transparent conducting TiO2 films Reviewed

    T. L. Chen, Y. Furubayashi, Y. Hirose, T. Hitosugi, T. Shimada, T. Hasegawa

    JOURNAL OF PHYSICS D-APPLIED PHYSICS   40 ( 19 )   5961 - 5964   2007.10

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    DOI: 10.1088/0022-3727/40/19/026

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  • Direct observation of vortex lattice in Bi2Sr2CaCu2O8+delta by low temperature STM/STS Reviewed

    Noritaka Fukuo, Hideki Mashima, Taro Hitosugi, Satoshi Uchida, Jun-ichi Shimoyama, Kohji Kishio, Yuji Matsumoto, Tetsuya Hasegawa

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   460   734 - 735   2007.9

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    DOI: 10.1016/j.physc.2007.03.157

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  • Fabrication of low resistivity Nb-doped TiO2 transparent conductive polycrystalline films on glass by reactive sputtering Reviewed

    Naoomi Yamada, Taro Hitosugi, Ngoc Lam Huong Hoang, Yutaka Furubayashi, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46 ( 8A )   5275 - 5277   2007.8

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    DOI: 10.1143/JJAP.46.5275

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  • Fabrication of highly conductive Ti1-xNbxO2 polycrystalline films on glass substrates via crystallization of amorphous phase grown by pulsed laser deposition Reviewed

    T. Hitosugi, A. Ueda, S. Nakao, N. Yamada, Y. Furubayashi, Y. Hirose, T. Shimada, T. Hasegawa

    APPLIED PHYSICS LETTERS   90 ( 21 )   212106   2007.5

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    DOI: 10.1063/1.2742310

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  • Transport properties of d-electron-based transparent conducting oxide: Anatase Ti1-xNbxO2 Reviewed

    Yutaka Furubayashi, Naoomi Yamada, Yasushi Hirose, Yukio Yamamoto, Makoto Otani, Taro Hitosugi, Toshihiro Shimada, Tetsuya Hasegawa

    JOURNAL OF APPLIED PHYSICS   101 ( 9 )   2007.5

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    DOI: 10.1063/1.2721748

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  • Fabrication of TiO2-based transparent conducting oxide films on glass by pulsed laser deposition Reviewed

    Taro Hitosugi, Atsuki Ueda, Yutaka Furubayashi, Yasushi Hirose, Seiji Konuma, Toshihiro Shimada, Tetsuya Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   46 ( 1-3 )   L86 - L88   2007.1

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    DOI: 10.1143/JJAP.46.L86

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  • Intrinsic Faraday spectra of ferromagnetic rutile Ti1-xCoxO2-delta Reviewed

    Yasushi Hirose, Taro Hitosugi, Yutaka Furubayashi, Go Kinoda, Kazuhisa Inaba, Toshihiro Shimada, Tetsuya Hasegawa

    APPLIED PHYSICS LETTERS   88 ( 25 )   2006.6

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    DOI: 10.1063/1.2213517

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  • Enhancement of magneto-optical properties of anatase Co : TiO2 Co-doped with Nb Reviewed

    G Kinoda, T Hitosugi, Y Yamamoto, Y Furubayashi, K Inaba, Y Hirose, T Shimada, T Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   45 ( 12-16 )   L387 - L389   2006.4

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    DOI: 10.1143/JJAP.45.L387

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  • Carrier induced ferromagnetism in Nb doped Co : TiO2 and Fe : TiO2 epitaxial thin film Reviewed

    T Hitosugi, G Kinoda, Y Yamamoto, Y Furubayashi, K Inaba, Y Hirose, K Nakajima, T Chikyow, T Shimada, T Hasegawa

    JOURNAL OF APPLIED PHYSICS   99 ( 8 )   08M121   2006.4

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    DOI: 10.1063/1.2177194

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  • Magnetic properties of rutile Ti1-xFexO2 epitaxial thin films Reviewed

    K Inaba, T Hitosugi, Y Hirose, Y Furubayashi, G Kinoda, Y Yamamoto, TW Kim, H Fujioka, T Shimada, T Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   45 ( 4-7 )   L114 - L116   2006.2

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    DOI: 10.1143/JJAP.45.L114

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  • Novel transparent conducting oxide: Anatase Ti1-xNbxO2 Reviewed

    Y Furubayashi, T Hitosugi, Y Yamamoto, Y Hirose, G Kinoda, K Inaba, T Shimada, T Hasegawa

    THIN SOLID FILMS   496 ( 1 )   157 - 159   2006.2

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    DOI: 10.1016/j.tsf.2005.08.245

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  • CEMS study on diluted magneto titanium oxide films prepared by pulsed laser deposition Reviewed

    K. Nomura, K. Inaba, S. Iio, T. Hitosugi, T. Hasegawa, Y. Hirose, Z. Homonnay

    Hyperfine Interactions   168 ( 1-3 )   1065 - 1071   2006.2

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    DOI: 10.1007/s10751-006-9406-2

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    Other Link: http://orcid.org/0000-0003-0625-1778

  • Electronic inhomogeneity of heavily overdoped Bi2-xPbxSr2CuOy studied by low-temperature scanning tunneling microscopy/spectroscopy Reviewed

    H Mashima, N Fukuo, Y Matsumoto, G Kinoda, T Kondo, H Ikuta, T Hitosugi, T Hasegawa

    PHYSICAL REVIEW B   73 ( 6 )   2006.2

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    DOI: 10.1103/PhysRevB.73.060502

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  • Development of high-throughput combinatorial terahertz time-domain spectrometer and its application to ternary composition-spread film

    M. Ohtani, T. Hitosugi, Y. Hirose, J. Nishimura, A. Ohtomo, M. Kawasaki, R. Inoue, M. Tonouchi, T. Shimada, T. Hasegawa

    Applied Surface Science   252 ( 7 )   2622 - 2627   2006.1

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    DOI: 10.1016/j.apsusc.2005.06.039

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  • Correlation between flux pinning and inhomogeneous electronic distribution of Bi2 Sr2 CaCu2 O8+δ directly probed by scanning tunneling microscopy/spectroscopy Reviewed

    Noritaka Fukuo, Hideki Mashima, Yuji Matsumoto, Taro Hitosugi, Tetsuya Hasegawa

    Physical Review B - Condensed Matter and Materials Physics   73 ( 22 )   2006

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    DOI: 10.1103/PhysRevB.73.220505

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  • A transparent metal: Nb-doped anatase TiO2 Reviewed

    Y Furubayashi, T Hitosugi, Y Yamamoto, K Inaba, G Kinoda, Y Hirose, T Shimada, T Hasegawa

    APPLIED PHYSICS LETTERS   86 ( 25 )   252101   2005.6

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    DOI: 10.1063/1.1949728

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  • Femtosecond-Laser-Assisted Chemical Vapor Deposition of Cr Metal

    Hitosugi Taro, Mizuno Takeshi

    Jpn J Appl Phys   44 ( 19 )   L596 - L598   2005.4

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    Focused femtosecond lasers have been used to deposit Cr lines by the nonlinear excitation of Cr(CO)6 on the surfaces of BK7 glass, soda glass and Cr thin films. Cr lines with a linewidth of 570 nm, which is beyond the diffraction limit, were deposited on BK7 glass. The surface morphology of the deposits were found to be sensitive not only to a fluence of laser pulses but also to the numerical apertures of various objective lenses.

    DOI: 10.1143/JJAP.44.L596

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  • Room-temperature adsorption of Si atoms on H-terminated Si(001)-2 x 1 surface Reviewed

    Hiroshi Kajiyama, Y. Suwa, S. Heike, M. Fujimori, J. Nara, T. Ohno, S. Matsuura, T. Hitosugi, T. Hashizume

    Journal of the Physical Society of Japan   74 ( 1 )   389 - 392   2005.1

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    DOI: 10.1143/JPSJ.74.389

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  • Ta-doped anatase TiO2 epitaxial film as transparent conducting oxide Reviewed

    T Hitosugi, Y Furubayashi, A Ueda, K Itabashi, K Inaba, Y Hirose, G Kinoda, Y Yamamoto, T Shimada, T Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   44 ( 33-36 )   L1063 - L1065   2005

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    DOI: 10.1143/JJAP.44.L1063

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  • Heteroepitaxial growth of rutile TiO2 on GaN(0001) by pulsed laser deposition Reviewed

    T Hitosugi, Y Hirose, J Kasai, Y Furubayashi, M Ohtani, K Nakajima, T Chikyow, T Shimada, T Hasegawa

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   44 ( 50-52 )   L1503 - L1505   2005

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    DOI: 10.1143/JJAP.44.L1503

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  • An optical configuration based on flying head structure for near-field recording Reviewed

    Takeshi Mizuno, Naoto Kojima, Taro Hitosugi, Kageyasu Sako, Kenjiro Watanabe

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers   43 ( 4 A )   1403 - 1409   2004

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    DOI: 10.1143/JJAP.43.1403

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  • Dopant-Pair Structures Segregated on a Hydrogen-Terminated Si(100) Surface Reviewed

    Yuji Suwa, S. Matsuura, M. Fujimori, S. Heike, T. Onogi, H. Kajiyama, T. Hitosugi, K. Kitazawa, T. Uda, T. Hashizume

    Physical Review Letters   90 ( 15 )   4   2003

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    DOI: 10.1103/PhysRevLett.90.156101

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  • Direct imaging of thermodynamic process in atom migration by using scanning tunneling microscopy Reviewed

    Y Suwa, T Hitosugi, S Matsuura, S Heike, S Watanabe, T Onogi, T Hashizume

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   41 ( 5A )   3085 - 3091   2002.5

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    DOI: 10.1143/JJAP.41.3085

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  • Reduced density of missing-dimer vacancies on tungsten-contaminated Si(100)-(2 x n) surface by hydrogen termination Reviewed

    S Matsuura, T Hitosugi, S Heike, A Kida, Y Suwa, T Onogi, S Watanabe, K Kitazawa, T Hashizume

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   39 ( 7B )   4518 - 4520   2000.7

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  • Direct observation of one-dimensional Ga-atom migration on a Si(100)-(2 x 1)-H surface: A local probe of adsorption energy variation

    T Hitosugi, Y Suwa, S Matsuura, S Heike, T Onogi, S Watanabe, T Hasegawa, K Kitazawa, T Hashizume

    PHYSICAL REVIEW LETTERS   83 ( 20 )   4116 - 4119   1999.11

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    DOI: 10.1103/PhysRevLett.83.4116

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  • Jahn-Teller distortion in dangling-bond linear chains fabricated on a hydrogen-terminated Si(100)-2 x 1 surface

    T Hitosugi, S Heike, T Onogi, T Hashizume, S Watanabe, ZQ Li, K Ohno, Y Kawazoe, T Hasegawa, K Kitazawa

    PHYSICAL REVIEW LETTERS   82 ( 20 )   4034 - 4037   1999.5

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    DOI: 10.1103/PhysRevLett.82.4034

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  • Property of atomic structures fabricated on the hydrogen-terminated Si(100) surface Reviewed

    T Hashizume, S Heike, T Hitosugi, S Watanabe, Y Wada, M Ichimura, T Onogi, T Hasegawa, K Kitazawa

    QUANTUM COHERENCE AND DECOHERENCE   249 - 252   1999

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  • Initial Backbond Oxidation at an Unpaired Dangling Bond Site on a Hydrogen-Terminated Si(100)2&times;1 Surface

    Kajiyama Hiroshi, Heike Seiji, Hitosugi Taro, Hashizume Tomihiro

    Jpn. J. Appl. Phys.   37 ( 11 )   L1350 - L1353   1998.11

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    Language:English   Publisher:The Japan Society of Applied Physics  

    The oxidation reaction at an unpaired dangling bond (DB) site on a hydrogen-terminated Si(100)2&times;1 surface was studied using an ultrahigh-vacuum scanning tunneling microscope. The surface image was observed in situ during the exposure to O2 molecules at room temperature. During exposure, the unpaired DBs induced structural changes around themselves, and they were mostly localized on one side of a Si dimer bond. We conclude that the backbonds near an unpaired DB were preferentially oxidized, following the dissociation of O2 molecules at the unpaired DB site. Based on high-resolution measurements, models of backbond-oxidized-structure were proposed.

    DOI: 10.1143/JJAP.37.L1350

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  • Scanning tunnelling spectroscopy of dangling-bond wires fabricated on the Si(100)-2x1-H surface Reviewed

    T Hitosugi, T Hashizume, S Heike, Y Wada, S Watanabe, T Hasegawa, K Kitazawa

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   66   S695 - S699   1998.3

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  • Scanning tunneling microscopy/spectroscopy of dangling-bond wires fabricated on the Si(100)-2×1-H surface

    Taro Hitosugi, T. Hashizume, S. Heike, H. Kajiyama, Y. Wada, S. Watanabe, T. Hasegawa, K. Kitazawa

    Applied Surface Science   130-132   340 - 345   1998

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier Sci B.V.  

    DOI: 10.1016/S0169-4332(98)00081-6

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  • Electronic structures of dangling-bond structures fabricated on hydrogen-terminated Si(100)-2x1 surfaces Reviewed

    T Hitosugi, T Hashizume, S Heike, H Kajiyama, Y Wada, S Watanabe, T Hasegawa, K Kitazawa

    DEFECT AND DIFFUSION FORUM   162   43 - 57   1998

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  • Scanning Tunneling Spectroscopy of Dangling-Bond Wires Fabricated on the Si(100)-2*1-H Surface.

    Hitosugi Taro, Hashizume Tomihiro, Heike Seiji, Watanabe Satoshi, Wada Yasuo, Hasegawa Tetsuya, Kitazawa Koichi

    Japanese Journal of Applied Physics   36 ( 3 )   L361 - L364   1997

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    Language:English   Publisher:The Japan Society of Applied Physics  

    Tunneling spectroscopy of atomic-scale dangling-bond wires on a hydrogen-terminated Si(100)-2×1-H surface is studied using ultrahigh-vacuum scanning tunneling microscopy. Individual dangling bonds are fabricated by extracting hydrogen atoms one by one from the hydrogen terminated surface to form atomic-scale dangling-bond wires. These wires show a finite density of states at the Fermi level and do not show semiconductive band gaps. The results are compared with first-principles theoretical calculations.

    DOI: 10.1143/jjap.36.L361

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  • マテリアル×機械学習×ロボット : 進化するマテリアルズ・インフォマティクス

    一杉太郎

    東京化学同人  2024.3  ( ISBN:9784807913480

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    Total pages:viii, 194p   Language:Japanese  

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  • 全固体電池の界面制御による電池性能の向上

    河底秀幸、西尾和記、一杉太郎( Role: Contributor)

    書籍名 : 二次電池の材料に関する最新技術開発、技術情報協会  2022.6  ( ISBN:9784861048852

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    Total pages:738p   Language:Japanese  

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  • 自律的物質創製技術

    石附直弥, 清水亮太, 一杉太郎( Role: Contributor197-207)

    書籍名 : データ駆動型材料開発 : オントロジーとマイニング、計測と実験装置の自動制御、エヌ・ティー・エス  2021.11  ( ISBN:9784860437596

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    Total pages:3, 6, 244, 6, 図版26p   Language:Japanese  

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  • 機械学習とロボットの導入による自律的な物質材料開発の取り組みとは?

    清水亮太, 一杉太郎( Role: Contributor583-594)

    書籍名 : マテリアルズ・インフォマティクスQ&A集 : 解析実務と応用事例、情報機構  2020.12  ( ISBN:9784865022049

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    Total pages:xix, 597p   Language:Japanese  

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  • 理想的なモデル薄膜電極の作製と内部抵抗低減技術

    白木将, 西尾和記, 一杉太郎( Role: Contributor217-226)

    書籍名 : 全固体電池の界面抵抗低減と作製プロセス、評価技術、技術情報協会  2020.3  ( ISBN:9784861047800

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    Total pages:490p   Language:Japanese  

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  • AIとロボットを融合した全自動システムによる機能性薄膜創製

    清水亮太, 一杉太郎( Role: Contributor373-381)

    書籍名 :人と共生するAI革命 : 活用事例からみる生活・産業・社会の未来展望、 エヌ・ティー・エス  2019.6  ( ISBN:9784860436087

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    Total pages:xiv, iii, xi, 433, xiip   Language:Japanese  

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  • 全固体電池における低抵抗固体界面の実現

    西尾和記、一杉太郎( Role: Contributor)

    書籍名 : 全固体リチウム電池の開発動向と応用展望、シーエムシー出版  2019.6  ( ISBN:9784781314198

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    Total pages:iv, 298p   Language:Japanese  

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  • X線CTR散乱法による固体電解質/電極界面の構造解析と界面抵抗低減の指針

    白澤徹郎、白木将、河底秀幸、一杉太郎( Role: Contributor400-407)

    書籍名 : リチウムイオン電池の分析、解析と評価技術事例集、技術情報協会  2019  ( ISBN:9784861047701

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    Total pages:522p   Language:Japanese  

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  • 全固体電池の固体電解質/電極界面における現象の基礎理論

    白木将、河底秀幸、一杉太郎( Role: Contributor)

    書籍名 : 全固体電池の基礎理論と開発最前線、シーエムシー・リサーチ  2018.7  ( ISBN:9784904482513

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    Total pages:x, 271p   Language:Japanese  

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  • 低い電極/電解質界面抵抗を有する全固体薄膜リチウム電池の作製とその界面構造

    白木将、白澤徹郎、河底秀幸、一杉太郎( Role: Contributor)

    書籍名 : 全固体電池のイオン伝導性向上技術と材料、製造プロセスの開発、技術情報協会  2017.2  ( ISBN:9784861046476

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    Total pages:475p, 図版 [7] p   Language:Japanese  

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  • 固体電解質中Li濃度分布の電圧印加下その場測定

    杉山一生, 齋藤正裕, 一杉太郎( Role: Contributor)

    書籍名: 全固体電池のイオン伝導性向上技術と材料、製造プロセスの開発、技術情報協会 、  2017.2  ( ISBN:9784861046476

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  • イオン伝導経路を規定した電解質・電極界面のイオン伝導性定量評価

    白木将, 春田正和, 一杉太郎( Role: Contributor280-284)

    書籍名 : LiBの高容量・高耐久化のための電極-電解液(質)の界面制御技術と解析・評価法、技術情報協会  2015.2  ( ISBN:9784861045714

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    Total pages:350p, 図版 [3] p   Language:Japanese  

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  • 透明導電性を示す遷移金属酸化物(TiO2等)

    一杉太郎, 長谷川哲也( Role: Contributor)

    書籍名 : 透明導電膜の技術、オーム社  2014.4  ( ISBN:9784274215223

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    Total pages:xiii, 424p   Language:Japanese  

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  • 透明超伝導体の開発

    一杉太郎, 大澤健男( Role: Contributor)

    書籍名 : 超伝導現象と高温超伝導体、エヌ・ティー・エス  2013.3  ( ISBN:9784864690577

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    Total pages:xi, 504, 13p, 図版12p   Language:Japanese  

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  • 原子操作による表面物質創製

    一杉太郎( Role: Contributor)

    書籍名 : 表面新物質創製、共立出版  2011.9  ( ISBN:9784320033726

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    Total pages:xii, 192p, 図版1枚   Language:Japanese  

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  • 走査トンネル顕微鏡技術

    橋詰, 富博, 一杉, 太郎

    岩波書店  2011.1  ( ISBN:9784000111775

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    Total pages:x, 106p   Language:Japanese  

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  • 東大式現代科学用語ナビ : キーワードでわかるサイエンスの「いま」

    一杉太郎( Role: Contributor)

    化学同人  2009.9  ( ISBN:9784759812787

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    Total pages:vi, 235p   Language:Japanese  

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  • TiO2系透明導電体

    一杉太郎( Role: Contributor)

    書籍名:ITOとその代替材料開発の現状、シーエムシー出版  2008.3  ( ISBN:9784781300016

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    Total pages:viii, 304p   Language:Japanese  

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  • 透明導電膜開発のための基礎技術・装置・測定、評価法

    一杉太郎( Role: Contributor)

    書籍名:ラボレベル・研究初期で必要となる発光素子、発光デバイス開発のための基礎技術・装置・測定、評価法、情報機構  2008.3  ( ISBN:9784904080016

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  • 透明導電膜

    一杉太郎, 長谷川哲也( Role: Contributor)

    書籍名:FPD・DSSC・光メモリーと機能性色素の最新技術と材料開発、技術教育出版,エヌ・ティー・エス (発売)  2008.1  ( ISBN:9784907837167

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    Total pages:xii, 544p, 図版3p   Language:Japanese  

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  • TiO2系透明導電体

    一杉太郎( Role: Contributor)

    書籍名:最新透明導電膜大全集 : 材料別特性と代替展望/リサイクル・工程別ノウハウ・応用別要求特性等、情報機構  2007  ( ISBN:9784901677875

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  • 全固体リチウム電池の界面制御技術とその評価

    西尾 和記, 一杉 太郎

    Material stage   23 ( 11 )   15 - 19   2024.2

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  • Surface X-ray Diffraction for the Observation of Solid-State Battery Interfaces

    Tetsuroh SHIRASAWA, Shigeru KOBAYASHI, Kazunori NISHIO, Taro HITOSUGI

    Denki Kagaku   91 ( 3 )   330 - 336   2023.9

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    Publisher:The Electrochemical Society of Japan  

    DOI: 10.5796/denkikagaku.23-te0006

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  • 界面状態の解明

    一杉 太郎

    化学   78 ( 1 )   30 - 32   2023.1

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  • 固体電解質と電極活物質の界面を定量的に理解する

    一杉 太郎, 西尾 和記

    電気化学   90 ( 4 )   2022.12

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  • 機械学習とロボットは,研究者を「自由」にする

    一杉 太郎

    日本物理学会誌   77 ( 9 )   592   2022.9

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  • 界面組成・構造の制御による全固体電池の特性向上 ―⾃動的・⾃律的に研究を進める時代に、我々研究者は何に注⼒するべきかー

    小林 成, 一杉太郎

    月刊ファインケミカル   51 ( 7 )   2022.7

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  • 加熱処理による全固体電池の性能向上

    小林成, 一杉太郎

    工業材料   ( 70 )   25 - 29   2022.4

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  • AIロボット ー何ができて何ができない?ー

    一杉太郎

    現代化学   ( 612 )   30 - 32   2022.3

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  • 材料開発の現場でベイズ最適化を使いこなす

    中山亮, 一杉太郎

    KEC情報   ( 260 )   17 - 24   2022.1

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  • Double Dirac cone and interlayer band in the Ca-intercalated graphene

    一ノ倉聖, 徳田啓, 福嶋隆司朗, 堀井健太郎, 遠山晴子, 秋山了太, 出田真一郎, 田中清尚, 清水亮太, 一杉太郎, 長谷川修司, 平原徹

    日本物理学会講演概要集(CD-ROM)   77 ( 1 )   2022

  • Controlling the Ionic and Electronic Transport at the All-solid-state Battery Interfaces

    Shigeru KOBAYASHI, Kazunori NISHIO, Tetsuroh SHIRASAWA, Taro HITOSUGI

    Vacuum and Surface Science   64 ( 12 )   542 - 547   2021.12

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    Publisher:Surface Science Society Japan  

    DOI: 10.1380/vss.64.542

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  • 全固体リチウム電池とレーザー”〜レーザー堆積法を活用した全固体Li電池の界面研究〜

    西尾 和記, 一杉太郎

    光アライアンス   ( 32 )   48 - 53   2021.12

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  • 車載応用に向けた全固体リチウム電池の化学

    渡邊 佑紀, 一杉 太郎

    日本化学会 化学と教育   69 ( 9 )   370 - 373   2021.9

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  • 機械学習とロボット技術を活用した研究室のデジタル化

    一杉太郎

    理論化学会誌「フロンティア」   3 ( 3 )   171 - 181   2021.7

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  • 薄膜新材料の「自律的」探索"

    小林成, 清水亮太, 一杉太郎

    ナノファイバー学会   12 ( 1,2 )   37 - 41   2021.7

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  • 高イオン伝導性分子結晶電解質の開発と、高い成形性を活用した全固体電池の作製

    守谷誠, 一杉太郎

    マテリアルステージ   21 ( 3 )   17 - 21   2021.6

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  • 全固体電池の界面不純物制御による容量倍増と電解質/正極界面におけるLi移動解析

    河底秀幸, 白澤徹郎, 西尾和記, 清水亮太, 白木將, 一杉太郎

    マテリアルステージ   21 ( 3 )   22 - 27   2021.6

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  • 局在水素によるヘテロ界面機能の強化

    笹原悠輝, 清水亮太, 一杉太郎

    60 ( 3 )   156 - 160   2021.3

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  • 全固体電池の容量倍増:Li イオン移動促進

    一杉太郎, 河底秀幸

    セラミックス   56 ( 5 )   371   2021.3

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  • 金属水素化物エピタキシャル薄膜の合成と電子物性

    笹原悠輝, 清水亮太, 一杉太郎

    セラミックス   56 ( 2 )   76 - 79   2021.2

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  • 全固体電池における電解質/電極界面の抵抗低減と高速充放電

    白木将, 一杉太郎

    車載テクノロジー   7 ( 9 )   42 - 46   2020.6

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  • Metal hydrides: Epitaxial thin film growth and electronic properties

    SHIMIZU Ryota, OGUCHI Hiroyuki, HITOSUGI Taro

    Oyo Buturi   89 ( 1 )   20 - 24   2020.1

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    Reports of superconductivity at temperatures above 200 K in high-pressure hydrogen sulfide (H2S) had generated considerable interest in metal hydrides and their physical properties. For the progress in both fundamental understanding and device application of metal hydrides, studies using single crystals or epitaxial thin films are essential. However, to date, a few metal hydride single crystals and epitaxial thin films have been fabricated, and both fundamental and applied research on these materials remain elusive compared with oxides and nitrides. Thus, we have started our research to establish a metal-hydride epitaxial thin film synthesis technology, and to search for new functionalities. This article reviews the recent progress, and we wish this article attracts much interest to a broad readership.

    DOI: 10.11470/oubutsu.89.1_20

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    Other Link: http://id.ndl.go.jp/bib/030169743

  • パラジウム薄膜の準安定水素化物形成とその緩和の観測 Reviewed

    小澤孝拓, 清水亮太, 小倉正平, 一杉太郎, 福谷克之

    表面と真空   62   492 - 497   2019.8

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    DOI: 10.1380/vss.62.492

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  • Li(Ni0.5Mn1.5)O4全固体薄膜電池における超高速充放電特性

    河底秀幸, 白木將, 一杉太郎

    車載テクノロジー   2019.3

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  • 真空プロセスによる電極/固体電解質接合界面の作製と界面抵抗の低減

    白木将, 一杉太郎

    マテリアルステージ   19   26 - 31   2019

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  • Frontiers of Research Using Scanning Probe Microscopy: Present and Future

    HITOSUGI Taro

    Hyomen Kagaku   38 ( 10 )   494 - 501   2017

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    Language:Japanese   Publisher:The Surface Science Society of Japan  

    <p>What are the frontiers of research using scanning probe microscopy (SPM)? To discuss this issue, it is crucial to understand the trends in academia, industry, and society. Based on the numbers of published articles, here, I present the trends of research using SPM. Furthermore, the prospects of SPM research are discussed.</p>

    DOI: 10.1380/jsssj.38.494

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  • 極めて低い電解質/電極界面抵抗を有する全固体リチウム電池の作製 -液体電解質系リチウムイオン電池を凌駕する高速充放電に向けて-

    春田正和, 白木将, 一杉太郎

    自動車技術   69 ( 9 )   116 - 120   2015

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  • 応用物理学的アプローチを活用した全固体Li電池研究:電極/電解質界面抵抗の低減に向けた界面研究

    白木将, 河底秀幸, 一杉太郎, 春田正和

    応用物理学会分科会会誌 M&B   26 ( 4 )   212 - 217   2015

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  • 全固体リチウム電池の酸化物電解質/電極界面におけるイオン伝導特性

    春田正和, 白木将, 一杉太郎

    エネルギーデバイス   20 ( 6 )   42 - 45   2015

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  • Fabrication of Two-Dimensional 10 nm Graphene Dot Array and Optical Characterization Reviewed

    T. Okada, K. Igarashi, P. Han, T. Hitosugi, C.H. Huang, C.Y. Su, S. Samukawa

    Extended Abstracts of the 2014 International Conference on Solid State Devices and Materials   2014.9

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    Language:English   Publisher:The Japan Society of Applied Physics  

    DOI: 10.7567/ssdm.2014.h-2-4

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  • 最先端顕微鏡で捉えた 酸化物薄膜の成長メカニズム : 表面・界面物性の解明と新規材料の創成に向けて

    一杉 太郎, 清水 亮太

    化学 = Chemistry   69 ( 9 )   31 - 36   2014.9

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  • LiH薄膜の配向制御とイオン伝導測定

    大口裕之, 池庄司民夫, 池庄司民夫, 桑野博喜, 白木将, 折茂慎一, 折茂慎一, 一杉太郎

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   75th   2014

  • LiHエピタキシャル薄膜の成長機構

    大口裕之, 池庄司民夫, 池庄司民夫, 桑野博喜, 白木将, 折茂慎一, 折茂慎一, 一杉太郎

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   61st   2014

  • Transparent Conductor based on Transition Metal Oxide

    33 ( 11 )   37 - 44   2013.11

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  • In situ investigation of oxide thin film growth using scanning tunneling microscopy.

    一杉太郎, 清水亮太, 大澤健男, 岩谷克也

    応用物理   82 ( 2 )   141 - 145   2013.2

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  • MgO(100)基板上におけるLiH薄膜合成

    大口裕之, 桑野博喜, 折茂慎一, 折茂慎一, 白木将, 一杉太郎

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   74th   2013

  • 水素化リチウム薄膜合成条件の最適化

    大口裕之, 桑野博喜, 折茂慎一, 大澤健男, 白木将, 一杉太郎

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   60th   2013

  • Initial Growth Process of Perovskite Oxide Thin Films Reviewed

    OHSAWA Takeo, IWAYA Katsuya, SHIMIZU Ryota, HITOSUGI Taro

    Hyomen Kagaku   33 ( 6 )   357 - 362   2012.6

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    Language:Japanese   Publisher:The Surface Science Society of Japan  

    We have developed a low-temperature, high-magnetic-field scanning tunneling microscope combined with pulsedlaser deposition, and studied atomic-scale growth of SrTiO3 (STO) and LaAlO3 thin films. A (&radic;13&times;&radic;13 )-R33.7o STO(001) substrate, prepared in oxygen atmosphere, is atomically resolved and plays a crucial role in elucidating the initialgrowth process. When homoepitaxial STO films were grown on the (&radic;13&times;&radic;13 ) substrate surfaces, additional TiOx layer of the substrate was transferred to the film surfaces. Atomic-scale microscopic/spectroscopic approach opens up awayto atom-by-atom controlled oxide epitaxial films and heterostructures.

    DOI: 10.1380/jsssj.33.357

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  • Recent Developments in TiO2-based Transparent Conductors

    47   1 - 10   2012.2

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  • LiCoO2電池正極材料の粒界の電池特性への影響の第一原理計算

    森分博紀, 桑原彰秀, フィッシャー クレイグ, 幾原裕美, 黄栄, 大木栄幹, 大木栄幹, 一杉太郎, 幾原雄一

    JFCC研究成果集   2012   2012

  • LiCoO2薄膜中のΣ2粒界におけるLi伝導の第一原理計算

    森分博紀, FISHER Craig A.J., 桑原彰秀, HUANG Rong, HUANG Rong, 幾原裕美, GAO Xiang, 木村禎一, 幾原雄一, 幾原雄一, 幾原雄一, 一杉太郎, 大木栄幹, 大木栄幹

    電池討論会講演要旨集   53rd   2012

  • Atomic-Scale Observation of Initial Growth Process of Homoepitaxial SrTiO_3 Thin Films Reviewed

    IWAYA Katsuya, OHSAWA Takeo, SHIMIZU Ryota, HITOSUGI Taro

    Nihon Kessho Gakkaishi   53 ( 5 )   353 - 358   2011.10

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    Language:Japanese   Publisher:The Crystallographic Society of Japan  

    The surface structures of SrTiO3 thin films homoepitaxially grown by pulsed laser deposition (PLD) were studied using low temperature scanning tunneling microscopy (STM). We suggest microscopic pictures of the near-surface stoichiometry of SrTiO3 thin films, depending on their thickness and the growth mode. For comparison, an atomically ordered surface of SrTiO3 single crystal that is robust under typical thin film growth condition is shown. We atomically visualize the initial growth of homoepitaxial SrTiO3 thin film on this well-defined substrate, indicating that the surface structure of the substrate can be transferred to the film surface. Atomic-scale understanding of the surface structure of the substrate and the initial process of the thin film growth will provide new approach to realize oxide heterointerfaces that are controlled truly on an atomic scale.

    DOI: 10.5940/jcrsj.53.353

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  • LiCoO2エピタキシャル薄膜の成膜と物性評価

    一杉太郎, 白木将, 大澤健男, 熊谷明哉, 大木栄幹

    FC Report   29   108 - 109   2011

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  • First-principle Calculations of Dopant-Oxygen Vacancy Complexes in Transparent Conducting TiO_2 Systems

    KAMISAKA Hideyuki, HITOSUGI Taro, YAMASHITA Koichi

    Journal of the Surface Science Society of Japan   31 ( 7 )   343 - 351   2010.7

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  • 走査透過電子顕微鏡によるLi原子等軽元素の直接観察

    福永啓一, 黄栄, 齋藤智浩, 森分博紀, 平山司, 大木栄幹, 一杉太郎, 幾原雄一, 幾原雄一

    JFCC研究成果集   2010   2010

  • Recent Developments in TiO_2-based Transparent Conductor

    YAMADA Naoomi, HITOSUGI Taro, HASEGAWA Tetsuya

    Ceramics Japan   44 ( 5 )   360 - 364   2009.5

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  • Characteristics of TiO2-based transparent conductive oxide

    15 ( 5 )   20 - 25,図巻頭18   2009.5

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  • Carrier compensation mechanism of highly conductive anatase Ti <inf>0.94</inf>Nb<inf>0.06</inf>O<inf>2</inf> epitaxial thin films

    Hiroyuki Nogawa, Taro Hitosugi, Hideyuki Kamisaka, Kouichi Yamashita, Akira Chikamatsu, Kouhei Yoshimatsu, Hiroshi Kumigashira, Masaharu Oshima, Syoichiro Nadao, Yutaka Furubayashi, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

    Materials Research Society Symposium Proceedings   1074   41 - 45   2008.12

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  • Development of TiO_2-based transparent conducting oxide

    HITOSUGI Taro

    77 ( 11 )   1319 - 1323   2008.11

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  • Sputter Deposition of Anatase Titanum Dioxide Transparent Conducting Films

    YAMADA Naoomi, HITOSUGI Taro, HASEGAWA Tetsuya

    Journal of the Vacuum Society of Japan   51 ( 9 )   602 - 607   2008.9

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    We report recent progress on sputter-deposition of Ti0.94Nb0.06O2 polycrystalline (poly-TNO) thin films as ITO-alternative transparent conductor. In order to achieve low resistivity (ρ) in TNO, it is necessary to introduce oxygen deficiencies into anatase phase. However, growth of poly-TNO films on glass under relatively reducing atmosphere tends to stabilize the rutile phase with higher resistivity. We overcame this difficulty by developing a bi-layer technique using a TNO seed-layer, which prevents the formation of the rutile phase even under reducing deposition conditions. As a result, we succeeded in directly fabricating poly-TNO films with ρ of ~1×10-3 Ω cm and visible transmittance of 60~80%, although we still need to further improve these properties towards practical applications. By comparing carrier transport properties between poly-TNO films obtained by different synthesis routes, we discuss on material parameters that govern resistivity of poly-TNO films.

    DOI: 10.3131/jvsj2.51.602

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  • Recent Developments of Nb-doped Anatase TiO_2 Transparent Conductors

    YAMADA Naoomi, HITOSUGI Taro, HASEGAWA Tetsuya

    Journal of the Surface Science Society of Japan   29 ( 1 )   25 - 30   2008.1

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  • Alternative technology for transparent conductor

    Materials science & technology   78 ( 1 )   26 - 32   2008.1

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  • Sputter Deposition of TiO_2-Based Transparent Conducting Oxide

    HITOSUGI Taro, YAMADA Naoomi, HASEGAWA Tetsuya

    Journal of The Surface Finishing Society of Japan   58 ( 12 )   798 - 803   2007.12

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    DOI: 10.4139/sfj.58.798

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  • 脱・インジウム!! TiO2でつくる新しい透明導電体 (特集 動きだした元素戦略--化学の役割と研究の面白み) -- (ここまで来ている元素代替ケミストリー--フロントランナーが紹介する最新成果)

    一杉 太郎, 長谷川 哲也

    化学   62 ( 12 )   38 - 41   2007.12

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  • Nb-doped TiO_2 as Transparent Conducting Oxide on Glass Substrate

    HITOSUGI Taro, UEDA Atsuki, HASEGAWA Tetsuya

    Ceramics Japan   42 ( 1 )   32 - 36   2007.1

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  • Titanium Dioxide Based Transparent Conducting Oxide Reviewed

    Taro Hitosugi, Tetsuya Hasegawa, Yutaka Furubayashi

    Shinku/Journal of the Vacuum Society of Japan   50 ( 2 )   111 - 113   2007

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  • Transport Properties of Anatase Ti_<1-x>Nb_xO_2 Transparent Conductive Oxide

    FURUBAYASHI Yutaka, HITOSUGI Taro

    Butsuri   61 ( 8 )   589 - 593   2006.8

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    We, here, introduce transport properties and carrier scattering mechanism of a new transparent conductor, anatase Ti_<1-x>Nb_xO_2 epitaxial thin film. Anatase TiO_2, a wide gap semiconductor, show semiconductor to metal transition on Nb doping. It became clear that Ti 3d conduction band has weak nonparabolicity. Further, we revealed that the carrier scattering is dominated by grain boundaries and neutral impurity scattering.

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  • Response to "Comment on 'A transparent metal: Nb-doped anatase TiO2' [Appl. Phys. Lett. 86, 252101 (2005)]"

    Y Furubayashi, T Hitosugi, T Hasegawa

    APPLIED PHYSICS LETTERS   88 ( 22 )   2006.5

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  • Ferromagnetism in anatase TiO<inf>2</inf>codoped with Co and Nb

    T. Hitosugi, T. Hitosugi, T. Shimada, T. Shimada, T. Hasegawa, T. Hasegawa, G. Kinoda, K. Inaba, Y. Yamamoto, Y. Furubayashi, Y. Hirose

    Proceedings of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005   191 - 193   2006.1

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  • 研究ニュース

    岩澤 康裕, 唯 美津木, 長谷川 哲也, 一杉 太郎

    東京大学理学系研究科・理学部ニュース   37 ( 5 )   10 - 11   2006.1

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    30年の壁をついに越えた新型触媒の開発 : 分子状酸素によるベンゼンからフェノール直接合成の実現/電気を流す二酸化チタン : 新しい透明導電体の開発/

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  • Development of UHV-LT MFM operating in magnetic field Reviewed

    Hidetaka Sugaya, Taro Hitosugi, Toshihiro Shimada, Toshihiko Nagamura, Yuji Matsumoto, Tetsuya Hasegawa

    AIP Conference Proceedings   850   1667 - 1668   2006

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    DOI: 10.1063/1.2355349

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  • Correlation between vortex distribution and electronic inhomogeneity in Bi2Sr2CaCu2O8+delta as probed by STM/STS Reviewed

    Noritaka Fukuo, Hideki Mashima, Go Kinoda, Taro Hitosugi, Toshihiro Shimada, Keisuke Shimizu, Jun-ichi Shimoyama, Kohji Kishio, Yuji Matsumoto, Tetsuya Hasegawa

    LOW TEMPERATURE PHYSICS, PTS A AND B   850   797 - +   2006

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  • Scanning tunneling microscopy/spectroscopy of heavily overdoped Bi2Sr2CuOy single crystals Reviewed

    Hideki Mashima, Noritaka Fukuo, Go Kinoda, Taro Hitosugi, Toshihiro Shimada, Takeshi Kondo, Yoshinori Okada, Hiroshi Ikuta, Yuji Matsumoto, Tetsuya Hasegawa

    LOW TEMPERATURE PHYSICS, PTS A AND B   850   509 - +   2006

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  • New transparent conductors anatase Ti<inf>1-x</inf>M<inf>x</inf>O <inf>2</inf> (M=Nb,Ta): Transport and optical properties

    Yutaka Furubayashi, Taro Hitosugi, Taro Hitosugi, Yukio Yamamoto, Yasushi Hirose, Makoto Otani, Kiyomi Nakajima, Toyohiro Chikyow, Toshihiro Shimada, Toshihiro Shimada, Tetsuya Hasegawa, Tetsuya Hasegawa

    Materials Research Society Symposium Proceedings   905   13 - 18   2005.12

  • Structural Relaxation of Atomic Wires Fabricated on Hydrogen-Terminated Silicon Surfaces

    Taro Hitosugi

    58 ( 9 )   688 - 692   2003

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  • An optical flying head for a near-field recording system Reviewed

    Takeshi Mizuno, Taro Hitosugi, Naoto Kojima, Shigeru Yamazaki, Kageyasu Sako, Kenjiro Watanabe

    Proceedings of SPIE - The International Society for Optical Engineering   4342   260 - 267   2002

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    DOI: 10.1117/12.453433

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  • An optical flying head for a near-field recording system: Part II

    T Mizuno, K Sako, T Noshiro, H Kato, N Kojima, T Hitosugi, S Yamazaki, KI Watanabe

    ISOM/ODS 2002: INTERNATIONAL SYMPOSIUM ON OPTICAL MEMORY AND OPTICAL DATA STORAGE TOPICAL MEETING, TECHNICAL DIGEST   290 - 292   2002

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  • An optical flying head for a near-field recording system: Part II

    T Mizuno, K Sako, T Noshiro, H Kato, N Kojima, T Hitosugi, S Yamazaki, KI Watanabe

    ISOM/ODS 2002: INTERNATIONAL SYMPOSIUM ON OPTICAL MEMORY AND OPTICAL DATA STORAGE TOPICAL MEETING, TECHNICAL DIGEST   290   290 - 292   2002

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  • A practical fabrication of an optical flying head for a near-field recording system Reviewed

    Naoto Kojima, Takeshi Mizuno, Taro Hitosugi, Atsumichi Kawashima, Kenjiro Watanabe

    Proceedings of SPIE - The International Society for Optical Engineering   4342   268 - 276   2002

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    DOI: 10.1117/12.453435

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  • Probing of subsurface dopants buried in silicon by scanning tunneling microscopy Reviewed

    YJ Suwa, T Hitosugi, S Matsuura, S Heike, S Watanabe, T Onogi, T Hashizume

    PROCEEDINGS OF THE 25TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS, PTS I AND II   87   431 - 432   2001

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  • Nanoscale Semiconductor Processes Using STM and AFM Lithographies. Fabrication of Atomic Ga Wires on Si Surface and Its Property.

    HASHIZUME Tomihiro, HEIKE Seiji, HITOSUGI Taro, WATANABE Satoshi, ICHIMURA Masahiko, ONOGI Toshiyuki

    J. Surf. Sci. Soc. Jpn.   19 ( 11 )   716 - 721   1998

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    Scanning tunneling microscopy/spectroscopy (STM/STS) and atom manipulation have been used to fabricate and evaluate atomic-scale structures on a hydrogen-terminated Si(100)-2×1-H surface. Atomic-scale Ga wires are fabricated by using selectively adsorbing thermally evaporated Ga atoms on the dangling-bond patterns. Electronic structures of the dangling-bond wires and theoretically predicted properties of the Ga structures, such as the conductivity and the flat-band ferromagnetic property are addressed.

    DOI: 10.1380/jsssj.19.716

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Presentations

  • Depth distribution measurement of 7Li in all-solid-state battery using 7Li(p, α)4He

    岸奈津子, 小林成, 杉澤優紀, 清水亮太, 一杉太郎, 一杉太郎, 関場大一郎

    日本物理学会講演概要集(CD-ROM)  2022 

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  • Fabrication and Growth Orientation Control of NaBH4 Epitaxial Thin Films

    中山亮, 河口祐飛, 清水亮太, 西尾和記, 大口裕之, KIM Sangryun, KIM Sangryun, KIM Sangryun, 折茂慎一, 折茂慎一, 一杉太郎, 一杉太郎

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)  2022 

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  • Operando lithium depth profiling in all-solid-state Li-ion batteries by means of Nuclear reaction analysis

    杉澤悠紀, 小林成, 岸奈津子, 清水亮太, 一杉太郎, 関場大一郎

    日本物理学会講演概要集(CD-ROM)  2021 

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  • Search for the hyperparameters of Bayesian optimization for materials synthesis

    中山亮, 清水亮太, 清水亮太, 芳賀太史, 木村武史, 安藤康伸, 安尾信明, 関嶋政和, 一杉太郎

    応用物理学会春季学術講演会講演予稿集(CD-ROM)  2021 

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  • Extended X-ray absorption fine structure study of an yttrium oxyhydride epitaxial thin film by sparse modeling analysis

    熊添博之, 五十嵐康彦, 五十嵐康彦, IESARI Fabio, IESARI Fabio, 清水亮太, 清水亮太, 小松遊矢, 一杉太郎, 松村大樹, 齋藤寛之, 岩満一功, 岡島敏浩, 妹尾与志木, 岡田真人, 岡田真人, 赤井一郎

    日本物理学会講演概要集(CD-ROM)  2021 

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  • Bayesian statistics-based analysis of AC impedance spectra

    Yu Miyazaki, Ryo Nakayama, Nobuaki Yasuo, Yuki Watanabe, Ryota Shimizu, Daniel M. Packwood, Kazunori Nishio, Yasunobu Ando, Masakazu Sekijima, Taro Hitosugi

    AIP Advances  2020.4 

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  • Prediction and synthesis of Pb-free inorganic perovskite

    酒向正己, 酒向正己, 千葉真人, 安尾信明, 渡部一貴, 瀧本啓人, 一杉太郎, 関嶋政和

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)  2020 

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  • Performance evaluation of NRA technique for operando analysis of lithium profiles in all-solid-state Li-ion batteries

    杉澤悠紀, 小林成, 岸奈津子, 清水亮太, 一杉太郎, 関場大一郎

    日本物理学会講演概要集(CD-ROM)  2020 

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  • Measurement of Li depth profile by NRA

    岸奈津子, 小林成, 杉澤悠紀, 関場大一郎, 清水亮太, 一杉太郎

    日本物理学会講演概要集(CD-ROM)  2020 

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  • Development of AI-robot-driven autonomous thin film growth system

    清水亮太, 清水亮太, 小林成, 安藤康伸, 一杉太郎

    応用物理学会春季学術講演会講演予稿集(CD-ROM)  2020 

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  • マイクロ波照射下でのペロブスカイト型金属酸化物の表面状態の電気化学的モニタリング

    松久将之, 藤井知, 椿俊太郎, 清水亮太, 鈴木榮一, 一杉太郎, 和田雄二

    日本化学会春季年会講演予稿集(CD-ROM)  2019 

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  • Li3PO4/LiCoO2界面における大きな界面抵抗をアニールにより低減する

    小林成, 清水亮太, 清水亮太, 渡邊佑紀, 西尾和記, 一杉太郎

    応用物理学会春季学術講演会講演予稿集(CD-ROM)  2019 

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  • ベイズ統計を用いた客観的な電気化学インピーダンススペクトル解析

    宮崎優, 安尾信明, 渡邊佑紀, 中山亮, 清水亮太, 清水亮太, 西尾和記, 安藤康伸, 関嶋政和, 一杉太郎

    応用物理学会春季学術講演会講演予稿集(CD-ROM)  2019 

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  • LiBH4 Epitaxial Film Synthesis by Complex Anion Transfer Method to Step into an Unexplored Field of Complex Hydrides

    Oguchi Hiroyuki, Kim Sangryun, Shimizu Ryota, Hitosugi Taro, Maruyama Shingo, Matsumoto Yuji, Orimo Shin-ichi

    JSAP Annual Meetings Extended Abstracts  2018.9  The Japan Society of Applied Physics

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  • Orientation control of YH2 epitaxial thin films using reactive magnetron sputtering

    Komatsu Yuya, Shimizu Ryota, Sasahara Yuki, Nishio Kazunori, Oguchi Hiroyuki, Orimo Shin-ichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts  2018.3  The Japan Society of Applied Physics

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  • Phase transition and electron-transport properties of NbHx (0 ≤ x < 1) epitaxial thin films

    Sasahara Yuki, Shimizu Ryota, Ogura Shohei, Nishio Kazunori, Sugiyama Issei, Oguchi Hiroyuki, Fukutani Katsuyuki, Orimo Shin-ichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts  2018.3  The Japan Society of Applied Physics

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  • Orientation control and evaluation of electron transport properties in TiH2 epitaxial thin films

    Sasahara Yuki, Shimizu Ryota, Nakanishi Rie, Sugiyama Issei, Nishio Kazunori, Oguchi Hiroyuki, Orimo Shin-ichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts  2017.8  The Japan Society of Applied Physics

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  • Epitaxial growth of single-phase magnesium dihydride using reactive magnetron sputtering

    Kakinokizono Takuya, Shimizu Ryota, Sugiyama Issei, Oguchi Hiroyuki, Orimo Shin-ichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts  2017.3  The Japan Society of Applied Physics

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  • Epitaixial growth of niobium hydride using reactive magnetron sputtering

    Sasahara Yuki, Shimizu Ryota, Sugiyama Issei, Oguchi Hiroyuki, Shiraki Susumu, Orimo Shinichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts  2017.3  The Japan Society of Applied Physics

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  • 核反応分析法を用いた金属水素化物薄膜内の水素量深さ分布解析

    清水亮太, 笹原悠輝, 小倉正平, 大口裕之, 折茂慎一, 折茂慎一, 福谷克之, 一杉太郎

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)  2017 

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  • Epitaixial growth of single-phase titanium dihydride using reactive magnetron sputtering

    Shimizu Ryota, Sasahara Yuki, Yamamoto Kuniko, Oguchi Hiroyuki, Shiraki Susumu, Orimo Shinichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts  2016.9  The Japan Society of Applied Physics

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  • Response of hydride ion in BaH2 to electric field: hydrogen forward scattering spectroscopy

    Oguchi Hiroyuki, Saito Masahiro, Sato Toyoto, Kuwano Hiroki, Orimo Shin-ichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts  2016.3  The Japan Society of Applied Physics

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  • 20pBE-2 Thickness dependence of electronic states in NbSe_2 thin film studied by high-resolution ARPES

    Nakata Y., Yamada K., Kimizuka H., Tanaka Y., Sugawara K., Souma S., Sato T., Shimizu R., Hitosugi T., Ueno K., Takahashi T.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan (JPS)

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  • 22pAJ-11 Sparse modeling approach for STS data analysis Part 1

    Miyama M. J., Okada Y., Hitosugi T., Hukushima K.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan (JPS)

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  • Temperature dependence of band structure in TiSe2 ultrathin film

    Sugawara K., Nakata Y., Shimizu R., Han P., Hitosugi T., Sato T., Takahashi T.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • Electronic structure of atomic layer NbSe2 thin film studied by high-resolution ARPES

    Nakata Y., Sugawara K., Souma S., Sato T., Shimuzu R., Hitosugi T., Ueno K., Takahashi T.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • High-energy-resolution x-ray emission spectroscopy study of epitaxial strain effects on spin states in LaCoO3 thin films

    Yokoyama Y., Hirata Y., Yamamoto K., Takubo K., Miyawaki J., Harada Y., Asakura D., Ikenaga E., Yamasaki Y., Fujioka J., Nakamura M., Shiraki S., Hitosugi T., Yoshimatsu K., Ohtomo A., Chikamatsu A., Hasegawa T., Taguchi M., Tanaka A., Kawasaki M., Tokura Y., Wadati H.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • High-resolution ARPES study of NbSe2 thin film grown on Graphene

    Nakata Y., Sugawara K., Souma S., Sato T., Shimuzu R., Hitosugi T., Ueno K., Takahashi T.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • 走査トンネル顕微鏡を用いたスピネル酸化物超伝導体LiTi2O4の電子状態研究(I)

    岡田佳憲, 安藤康伸, 清水亮太, 南谷英美, 白木将, 渡邉聡, 一杉太郎

    日本物理学会講演概要集(CD-ROM)  2015.9  The Physical Society of Japan (JPS)

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  • Pulsed laser deposition方を用いたLiHエピタキシャル薄膜成長と成長モード観察

    大口裕之, 大口裕之, 礒部繁人, 礒部繁人, 白木将, 桑野博喜, 一杉太郎, 折茂慎一, 折茂慎一

    日本金属学会講演概要(CD-ROM)  2015.9 

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  • ナノ電気化学セル顕微鏡:有機ゲルピペットの電池材料評価への応用

    熊谷明哉, 高橋康史, 猪又宏貴, 白木将, 山本邦子, 春田正和, 伊野浩介, 珠玖仁, 一杉太郎, 末永智一

    電気化学会大会講演要旨集(CD-ROM)  2015.3 

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  • ナノ電気化学セル顕微鏡:有機ゲルピペットを用いた局所電気化学測定条件の検討

    熊谷明哉, 高橋康史, 猪又宏貴, 白木将, 山本邦子, 春田正和, 伊野浩介, 珠玖仁, 一杉太郎, 末永智一

    応用物理学会春季学術講演会講演予稿集(CD-ROM)  2015.2 

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  • LiH thin film growth by pulsed laser deposition

    Oguchi Hiroyuki, Shiraki Susumu, Kuwano Hiroki, Orimo Shin-ichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts  2015.2  The Japan Society of Applied Physics

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    Event date: 2015.2

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  • 23pBE-8 β-NMR measurements on thin films of Li_4Ti_5O_<12> and LiTi_2O_4

    Umegaki I., Uyama T., Shiraki S., Hitosugi T., MacFadden R., Salman Z., Saddaoui H., Morris G., MacFalane A. W., Kiefl R., Sugiyama J.

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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    Event date: 2015

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  • 23pAB-10 High-resolution ARPES study of multilayer silcene intercalation compound CaSi_2

    Noguchi E., Sugawara K., Hitosugi T., Yaokawa R., Nakano H., Takahashi T.

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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    Event date: 2015

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  • Pulsed laser deposition法を用いた平坦なLiHエピタキシャル薄膜成長

    大口裕之, 大口裕之, 礒部繁人, 礒部繁人, 白木将, 桑野博喜, 折茂慎一, 折茂慎一, 一杉太郎

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)  2015 

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  • Pulsed laser deposition方を用いたLiHエピタキシャル薄膜成長と成長モード観察

    大口裕之, 大口裕之, 礒部繁人, 礒部繁人, 白木将, 桑野博喜, 一杉太郎, 折茂慎一, 折茂慎一

    日本金属学会講演概要(CD-ROM)  2015 

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  • 23pBE-5 Electronic structure study of SrVO_3 film by using scanning tunneling microscope (III)

    Okada Y., Chang T. R., Shimizu R., Chang Guoging, Jeng Hong-Tay, Shiraki S., Lin H., Hitosugi T.

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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  • 19pCD-5 μSR and ^8Li-NMR study on spinel Li_4Ti_5O_<12> and LiTi_2O_4

    Sugiyama J., Nozaki H., Umegaki I., Shiraki S., Hitosugi T., Suter Andreas, Prokscha Thomas, Salman Zaher, Lord James S., Mansson Martin, Morris Gerald D., MacFarlane Andrew W., Kie Robert F.

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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    Event date: 2015

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  • 19pCB-7 Sparse modeling approach to data analysis of STM Topography datasets

    Miyama M. J., Okada Y., Hitosugi T., Hukushima K.

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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    Event date: 2015

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  • LiFePO4正極薄膜材料表面のイオン電流応答における結晶粒・粒界の影響

    熊谷明哉, 高橋康史, 猪又宏貴, 白木将, 山本邦子, 春田正和, 伊野浩介, 珠玖仁, 一杉太郎, 末永智一

    電池討論会講演要旨集  2014.11 

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    Event date: 2014.11

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  • Orientation control and Li-ion conduction measurement of LiH thin films

    Oguchi Hiroyuki, Ikeshoji Tamio, Kuwano Hiroki, Shiraki Susumu, Orimo Shin-ichi, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts  2014.9  The Japan Society of Applied Physics

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    Event date: 2014.9

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  • 界面イオン伝導顕微鏡による正極薄膜材料表面におけるLiイオン挿入・脱離機構の可視化

    熊谷明哉, 高橋康史, 猪又宏貴, 白木将, 山本邦子, 春田正和, 伊野浩介, 珠玖仁, 一杉太郎, 末永智一

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)  2014.9 

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  • La0.75Ca0.25MnO3薄膜表面における構造・電子状態の第一原理計算

    中村俊也, 安藤康伸, 南谷英美, 清水亮太, 岩谷克也, 大澤健男, 一杉太郎, 渡邉聡

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)  2014.9 

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  • La0.7Ca0.3MnO3薄膜表面における構造・電子状態の原子スケール観察

    清水亮太, 岩谷克也, 大澤健男, 中村俊也, 安藤康伸, 南谷英美, 渡邉聡, 一杉太郎

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)  2014.9 

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  • 8aAS-9 Low-coverage bottom-up graphene-nanoribbon fabrication

    Han Patrick, Akagi Kazuto, Canova Filippo Federici, Mutoh Hirotaka, Shiraki Susumu, Iwaya Katsuya, Weiss Paul S., Asao Naoki, Hitosugi Taro

    Meeting abstracts of the Physical Society of Japan  2014.8  The Physical Society of Japan (JPS)

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    Event date: 2014.8

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  • 9pAF-4 Atomic and electronic structures of solid electrolyte/electrode interfaces(Atomistic boundary structures and their functions in lithium-ion batteries)

    Hitosugi Taro, Iwaya Katsuya, Shiraki Susumu

    Meeting abstracts of the Physical Society of Japan  2014.8  The Physical Society of Japan (JPS)

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  • STM/STSを用いたLa0.7Ca0.3MnO3薄膜表面の構造・電子状態評価 II(理論)

    中村俊也, 安藤康伸, 南谷英美, 清水亮太, 岩谷克也, 大澤健男, 一杉太郎, 渡邉聡

    日本物理学会講演概要集  2014.8 

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  • STM/STSを用いたLa0.7Ca0.3MnO3薄膜表面の構造・電子状態評価 I(実験)

    清水亮太, 岩谷克也, 大澤健男, 中村俊也, 安藤康伸, 南谷英美, 渡邉聡, 一杉太郎

    日本物理学会講演概要集  2014.8 

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  • 8pBK-3 Electronic structure study of SrVO_3 film by using scanning tunneling microscope (II)

    Okada Y., Chang T. R., Shimizu R., Lin H., Shiraki S., Hitosugi T.

    Meeting abstracts of the Physical Society of Japan  2014.8  The Physical Society of Japan (JPS)

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  • 27pCG-9 Electronic structure study of SrVO_3 film by using scanning tunneling microscope

    Okada Y., Shimizu R., Shiraki S., Hitosugi Taro

    Meeting abstracts of the Physical Society of Japan  2014.3  The Physical Society of Japan (JPS)

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    Event date: 2014.3

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  • Growth mechanism of a LiH epitaxial thin film

    Oguchi Hiroyuki, Ikeshoji Tamio, Kuwano Hiroki, Orimo Shin-ichi, Shiraki Susumu, Hitosugi Taro

    JSAP Annual Meetings Extended Abstracts  2014.3  The Japan Society of Applied Physics

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    Event date: 2014.3

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  • LiHエピタキシャル薄膜成長

    大口裕之, 池庄司民夫, 桑野博喜, 白木将, 一杉太郎, 折茂慎一, 折茂慎一

    日本金属学会講演概要(CD-ROM)  2014 

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  • 7pAS-3 Atomic and electronic structure investigation on La_<0.7>Ca_<0.3>MnO_3 thin film by STM/STS I (experiment)

    Shimizu R, Iwaya K, Ohsawa T, Nakamura S, Ando Y, Minamitani E, Watanabe S, Hitosugi T

    Meeting Abstracts of the Physical Society of Japan  2014  The Physical Society of Japan

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  • 7pAS-4 Atomic and electronic structure investigation on La_<0.7>Ca_<0.3>MnO_3 thin film by STM/STS II (theory)

    Nakamura Shunya, Ando Yasunobu, Minamitani Emi, Shmizu Ryota, Iwaya Katsuya, Ohsawa Takeo, Hitosugi Taro, Watanabe Satoshi

    Meeting Abstracts of the Physical Society of Japan  2014  The Physical Society of Japan

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  • MgO(100)基板上におけるLiH薄膜合成

    大口 裕之, 桑野 博喜, 折茂 慎一, 白木 将, 一杉 太郎

    応用物理学会学術講演会講演予稿集  2013.8  公益社団法人 応用物理学会

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  • STM observation of Li_xCoO_2 single crystal surfaces

    Iwaya K., Ogawa T., Minato T., Miyoshi T., Takeushi J., Kuwabara A., Moriwake H., Kim Y., Hitosugi T.

    Meeting abstracts of the Physical Society of Japan  2013.8  The Physical Society of Japan (JPS)

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  • 29aXP-1 Electronic structure of intercalated bilayer graphene C_6AC_6(A=Li,Ca)

    Sugawara K., Kanetani K., Sato T., Shimizu R., Iwaya K., Hitosugi T., Takahashi T.

    Meeting abstracts of the Physical Society of Japan  2013.3  The Physical Society of Japan (JPS)

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  • I-1-1 High-refractive-index Transparent Electrode for GaN LEDs

    HITOSUGI Taro

    Conference on Information, Intelligence and Precision Equipment : IIP  2013.3  The Japan Society of Mechanical Engineers

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    Event date: 2013.3

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    Anatase Nb-doped TiO_2 transparent conducting oxide has been formed on GaN(0001) surfaces using asputtering method.Amorphous films deposited at room temperature were annealed at a substrate temperature of 500℃ in vacuum to form single-phase anatase films.Films with a thickness of 170 nm exhibited a resistivity of 8×10^-4Ωcm with absorptance less than 5% at a wavelength of 460 nm.Furthermore,the refractive index of the Nb-doped TiO_2 was well matched to that of GaN. These findings indicate that Nb-doped TiO_2 is a promising material for use as transparent electrodes in GaN-based light emitting diodes(LEDs),particularly since reflection at the electrode/GaN boundary can be suppressed,enhancing the external quantum efficiency of blue LEDs.

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  • 水素化リチウム薄膜合成条件の最適化

    大口 裕之, 桑野 博喜, 折茂 慎一, 大澤 健男, 白木 将, 一杉 太郎

    応用物理学会学術講演会講演予稿集  2013.3  公益社団法人 応用物理学会

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  • LaAlO3/SrTiO3(001)ヘテロ構造のSTM/STSと電子伝導特性

    大澤健男, 大澤健男, 清水亮太, 岩谷克也, 白木将, 野島勉, 一杉太郎

    エレクトロセラミックス研究討論会講演予稿集  2013 

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  • Interface analysis using Scanning Kelvin Probe Force Microscopy

    Hashizume Tomihiro, Heike Seiji, Suwa Yuji, Kubota Shunsuke, Inoue Yosuke, Ishida Takashi, Saito Kaoru, Hitosugi Taro

    Abstract of annual meeting of the Surface Science of Japan  2012  The Surface Science Society of Japan

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    Event date: 2012

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  • Investigation of Electronic States and Conductivity during Thin-Film Growth of Perovskite Oxides

    Ohsawa Takeo, Suzuki Tohru, Shimizu Ryota, Iwaya Katsuya, Shiraki Susumu, Hitosugi Taro

    Abstract of annual meeting of the Surface Science of Japan  2012  The Surface Science Society of Japan

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  • Fabrication of LiCoO2 thin films on the reconstructed surfaces of metal single crystals

    Shiraki Susumu, Takagi Yoshitaka, Oki Hideki, Kumatani Akichika, Shimizu Ryota, Suzuki Toru, Ohsawa Takeo, Hitosugi Taro

    Abstract of annual meeting of the Surface Science of Japan  2012  The Surface Science Society of Japan

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  • 固相エピタキシャル法を利用したCeO2ナノ粒子上へのアナターゼTiO2の選択的結晶成長

    北條大介, 冨樫貴成, 大澤健男, 宮崎孝道, 作田祐介, 朝比奈俊輔, 一杉太郎, 阿尻雅文

    応用物理学関係連合講演会講演予稿集(CD-ROM)  2012 

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  • LiCoO2薄膜中のΣ2粒界におけるLi伝導の第一原理計算

    森分博紀, FISHER C. A. J., 桑原彰秀, HUANG R., 幾原裕美, GAO X., 木村禎一, 幾原雄一, 幾原雄一, 幾原雄一, 一杉太郎, 大木栄幹, 大木栄幹

    日本セラミックス協会年会講演予稿集  2012 

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  • α-Al2O3基板上のLiCoO2薄膜におけるドメイン境界

    FISHER C. A. J., ZHENG S., 桑原彰秀, 森分博紀, 幾原裕美, 一杉太郎, HUANG R., 大木栄幹, 大木栄幹, 幾原雄一, 幾原雄一

    日本セラミックス協会年会講演予稿集  2012 

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  • LiCoO2エピタキシャル薄膜における結晶粒界の界面抵抗

    熊谷明哉, 大澤健男, 清水亮太, 鈴木竜, 高木由貴, 白木将, 森分博紀, 幾原雄一, 幾原雄一, 幾原雄一, 一杉太郎

    固体イオニクス討論会講演要旨集  2012 

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  • LiCoO2エピタキシャル薄膜の電気伝導性におよぼす結晶粒界の寄与

    熊谷明哉, 大澤健男, 鈴木竜, 高木由貴, 白木将, 大木栄幹, 大木栄幹, 森分博紀, 幾原雄一, 幾原雄一, 幾原雄一, 一杉太郎

    応用物理学関係連合講演会講演予稿集(CD-ROM)  2012 

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  • LiCoO2エピタキシャル薄膜の伝導特性に与える結晶粒界の寄与

    熊谷明哉, 大澤健男, 鈴木竜, 高木由貴, 白木将, 大木栄幹, 大木栄幹, 森分博紀, 幾原雄一, 幾原雄一, 幾原雄一, 一杉太郎

    電気化学会大会講演要旨集  2012 

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  • 23pGE-6 Microscopy of interfaces of semiconductors, metals, and dielectric materials

    Hashizume T., Heike S., Iwadate Y., Ushiyama T., Kubota S., Inoue Y., Hitosugi T.

    Meeting abstracts of the Physical Society of Japan  2011.8  The Physical Society of Japan (JPS)

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    Event date: 2011.8

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  • 23pGE-6 Microscopy of interfaces of semiconductors, metals, and dielectric materials

    Hashizume T., Heike S., Iwadate Y., Ushiyama T., Kubota S., Inoue Y., Hitosugi T.

    Meeting abstracts of the Physical Society of Japan  2011.8  The Physical Society of Japan (JPS)

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  • 24aGM-1 Local electronic structures of TiO_2-terminated SrTiO_3(001) surfaces by STM/STS

    Iwaya K., Ohsawa T., Shimizu R., Hitosugi T.

    Meeting Abstracts of the Physical Society of Japan  2011  The Physical Society of Japan

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    Event date: 2011

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  • リチウム二次電池用LiCoO2系正極材料における界面の構造・特性

    FISHER C. A. J., 桑原彰秀, 森分博紀, 幾原裕美, HUANG R., 一杉太郎, 大木栄幹, 幾原雄一, 幾原雄一

    日本セラミックス協会年会講演予稿集  2011 

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  • リチウムイオン二次電池用電極材料LiCoO2の双晶境界における各イオンの原子配列

    鄭士建, クレイグ フィッシャー, 一杉太郎, 森分博紀, 大木栄幹, 幾原雄一, 幾原雄一, 幾原雄一

    日本セラミックス協会年会講演予稿集  2011 

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  • Liイオン二次電池用LiCoO2における界面の原子・電子構造

    フィッシャー クレイグ, 桑原彰秀, 森分博紀, 幾原裕美, 黄栄, 一杉太郎, 大木栄幹, 幾原雄一, 幾原雄一

    日本金属学会講演概要  2011 

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  • LiCoO2薄膜中の粒界構造の第一原理計算

    森分博紀, FISHER C. A. J., 桑原彰秀, HUANG R., 幾原裕美, ZHENG S., 幾原雄一, 幾原雄一, 幾原雄一, 一杉太郎, 大木栄幹, 大木栄幹

    日本セラミックス協会秋季シンポジウム講演予稿集  2011 

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  • 25pWB-12 Investigation of atomically-ordered SrTiO_3(001)-(√<13>×√<13>) reconstructed surface

    Shimizu R., Iwaya K., Ohsawa T., Hasegawa T., Hashizume T., Hitosugi T.

    Meeting abstracts of the Physical Society of Japan  2010.8  The Physical Society of Japan (JPS)

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    Event date: 2010.8

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  • 21aGE-3 STM/STS studies on the electronic structure of SrTiO_3 thin films

    Hitosugi T., Iwaya K., Ohsawa T., Shimizu R., Hashizume T.

    Meeting abstracts of the Physical Society of Japan  2010.3  The Physical Society of Japan (JPS)

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    Event date: 2010.3

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  • 30pTL-1 Transport properties and electronic states of anatase Ti_<1-x>W_xO_2 epitaxial thin films

    Takeuchi U., Hitosugi T., Tsuruhama T., Chikamatsu A., Kumigashira H., Oshima M., Hirose Y., Shimada T., Hasegawa T.

    Meeting abstracts of the Physical Society of Japan  2009.3  The Physical Society of Japan (JPS)

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    Event date: 2009.3

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  • Carrier compensation mechanism of highly conductive anatase Ti <inf>0.94</inf>Nb<inf>0.06</inf>O<inf>2</inf> epitaxial thin films

    Hiroyuki Nogawa, Taro Hitosugi, Hideyuki Kamisaka, Kouichi Yamashita, Akira Chikamatsu, Kouhei Yoshimatsu, Hiroshi Kumigashira, Masaharu Oshima, Syoichiro Nadao, Yutaka Furubayashi, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

    Materials Research Society Symposium Proceedings  2008.12 

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    Event date: 2008.12

    We investigated electrical conduction of anatase Ti0.94Nb 0.06O2 (TNO) epitaxial thin films in relation to oxygen defects generated by post-annealing. Annealing of TNO in oxygen was found to cause dramatic decreases in ne. Resonant photoemission spectroscopy measurements revealed that a deep acceptor state just above the top of valence band evolves, synchronized with the decrease of ne. We proposed that the acceptor state originates from interstitial oxygen atoms combined with Nb dopants and compensates electron carriers. © 2008 Materials Research Society.

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  • 26pWQ-3 Cryogenic STM/STS observations of Bi2212 single crystals under magnetic field VI

    Fukuo N., Hitosugi T., Uchida S., Shimoyama J., Kishio K., Matsumoto Y., Hasegawa T.

    Meeting abstracts of the Physical Society of Japan  2008.2  The Physical Society of Japan (JPS)

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    Event date: 2008.2

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  • 26pTD-12 FI(Field Ion)-STM using superconducting Nb tip

    Shimizu R., Hitosugi T., Fukuo N., Muranaka S., Shimada T., Hashizume T., Hasegawa T.

    Meeting abstracts of the Physical Society of Japan  2008.2  The Physical Society of Japan (JPS)

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  • 22pWF-2 Nonmetal-metal transition in anatase Nb-doped TiO_2

    Hitosugi T, Kmisaka H, Yamashita K, Chikamatsu A, Kumigashira H, Oshima M, Nogawa H, Tsuruhama T, Hoang N. L. H, Nakao S, Furubayashi Y, Kasai J, Hirose Y, Yamada N, Shimada T, Hasegawa T

    Meeting abstracts of the Physical Society of Japan  2007.8  The Physical Society of Japan (JPS)

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    Event date: 2007.8

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  • 18aTG-8 Scanning tunneling microscopy using Nb tip

    Shimizu R., Hitosugi T., Fukuo N., Shimada T., Hasegawa T.

    Meeting abstracts of the Physical Society of Japan  2007.2  The Physical Society of Japan (JPS)

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    Event date: 2007.2

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  • 21pWF-3 Cryogenic STM/STS observations of Bi2212 single crystals under magnetic field V

    Fukuo N., Hitosugi T., Uchida S., Shimoyama J., Kishio K., Matsumoto Y., Hasegawa T.

    Meeting Abstracts of the Physical Society of Japan  2007  The Physical Society of Japan

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    Event date: 2007

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  • 26aYH-8 XMCD measurements under magnetic field of transition metal doped TiO_2 epitaxial films

    Abe H., Shimada T., Nogawa H., Amemiya K., Ohta T., Inaba K., Hirose Y., Furubayashi Y., Yamamoto Y., Hitosugi T., Matsumoto Y., Hasegawa T.

    Meeting abstracts of the Physical Society of Japan  2006.8  The Physical Society of Japan (JPS)

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    Event date: 2006.8

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  • 27pTD-6 Temperature dependence of local pseudogap structures observed by cryogenic STM/STS

    Mashima Hideki, Muranaka Shinji, Ueda Atsuki, Fukuo Noritaka, Hitosugi Taro, Shimada Toshihiro, Okada Yoshinori, Kondo Takeshi, Ikuta Hiroshi, Matsumoto Yuji, Hasegawa Tetsuya

    Meeting abstracts of the Physical Society of Japan  2006.3  The Physical Society of Japan (JPS)

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    Event date: 2006.3

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  • 28aSC-4 XAS and XMCD measurements of transition metal doped TiO_2 epitaxial films

    Abe H., Shimada T., Nogawa H., Amemiya K., Ohta T., Inaba K., Hirose Y., Furubayashi Y., Yamamoto Y., Hitosugi T., Matsumoto Y., Hasegawa T.

    Meeting abstracts of the Physical Society of Japan  2006.3  The Physical Society of Japan (JPS)

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    Event date: 2006.3

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  • 28pRC-14 Spin-Polarized Carrier Traps of Organic Semiconductor Interfaces

    Nogawa H., Shimada T., Saiki K., Ueda A., Hirose Y., Yamamoto Y., Inaba K., Kasai J., Furubayashi Y., Hitosugi T., Hasegawa T.

    Meeting abstracts of the Physical Society of Japan  2006.3  The Physical Society of Japan (JPS)

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    Event date: 2006.3

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  • Ferromagnetism in anatase TiO<inf>2</inf>codoped with Co and Nb

    T. Hitosugi, T. Hitosugi, T. Shimada, T. Shimada, T. Hasegawa, T. Hasegawa, G. Kinoda, K. Inaba, Y. Yamamoto, Y. Furubayashi, Y. Hirose

    Proceedings of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005  2006.1 

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    Event date: 2006.1

    Magneto-optical Faraday rotation angle of ferromagnetic anatase Co-doped TiO2films is enhanced and can be controlled by Nb doping. A carrier density of films can be varied by Nb doping in this room-temperature ferromagnetic degenerate semiconductor. A Ti0.89Nb0.06CO0.05O2film showed a Faraday rotation angle of 1.5 × 104deg/cm at 400 nm. An anomalous Hall effect, showing that the charge carriers are spin polarized, is observed in this film.

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  • 30aUE-7 Cryogenic STM/STS observations of Bi2212 single crystals under magnetic field III

    Fukuo N., Mashima H., Hitosugi T., Shimada T., Uchida T., Shimoyama J., Kishio K., Matsumoto Y., Hasegawa T.

    Meeting Abstracts of the Physical Society of Japan  2006  The Physical Society of Japan

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    Event date: 2006

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  • 24aPS-84 Cryogenic STM/STS observations of Bi2212 single crystals under magnetic field IV

    Fukuo N., Hitosugi T., Shimada T., Uchida S., Shimoyama J., Kishio K., Matsumoto Y., Hasegawa T.

    Meeting Abstracts of the Physical Society of Japan  2006  The Physical Society of Japan

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  • New transparent conductors anatase Ti<inf>1-x</inf>M<inf>x</inf>O <inf>2</inf> (M=Nb,Ta): Transport and optical properties

    Yutaka Furubayashi, Taro Hitosugi, Taro Hitosugi, Yukio Yamamoto, Yasushi Hirose, Makoto Otani, Kiyomi Nakajima, Toyohiro Chikyow, Toshihiro Shimada, Toshihiro Shimada, Tetsuya Hasegawa, Tetsuya Hasegawa

    Materials Research Society Symposium Proceedings  2005.12 

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    Event date: 2005.12

    We have discovered new transparent conducting oxides (TCOs), anatase Ti1-xMxO2 (M=Nb,Ta), in thin film form, Both films with 0.03 ≤ x ≤ 0.06 showed resistivity of 2-3 × 10 -4 Ωcm and internal transmittance of ∼95% in the visible light region (40 nm in thickness), at room temperature. These values are comparable to those of typical TCOs, such as In2-xSn xO3 (ITO). © 2006 Materials Research Society.

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  • 21aPS-13 Local physical properties and manipulation of C_<60> thin film by using STM

    Muranaka S., Hitosugi T., Mashima H., Fukuo N., Shimada T., Hasegawa T.

    Meeting abstracts of the Physical Society of Japan  2005.8  The Physical Society of Japan (JPS)

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    Event date: 2005.8

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  • 19aYH-6 Cryogenic STM/STS observations of Bi2212 single crystals under magnetic filedl II

    Fukuo N., Mahisma H., Hitosugi T., Shimada T., Uchida T., Shimoyama J., Kishio K., Matsumoto Y., Hasegawa T.

    Meeting Abstracts of the Physical Society of Japan  2005  The Physical Society of Japan

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  • 22pYE-11 Low temperature STM observation of buckyferrocene epitaxial thin films

    Shimada T, Hasegawa T, Kaji T, Saiki K, Matsuo Y, Nakamura E, Muranaka N, Fukuo N, Mashima H, Hitosugi T

    Meeting Abstracts of the Physical Society of Japan  2005  The Physical Society of Japan

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  • 24pWA-3 Cryogenic STM/STS observations of Bi-2212 single crystals under the field

    Fukuo N, Hasegawa T, Mashima H., Kinoda G, Hitosugi T, Shimada T, Shimizu K., Shimoyama J, Kishio K., Matsumoto Y

    Meeting Abstracts of the Physical Society of Japan  2005  The Physical Society of Japan

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  • 15aPS-63 Development of UHV-LT-MFM operating under magnetic field

    Sugaya Hidetaka, Hitosugi Taro, Shimada Toshihiro, Nagamura Toshihiko, Matsumoto Yuji, Hasegawa Tetsuya

    Meeting abstracts of the Physical Society of Japan  2004.8  The Physical Society of Japan (JPS)

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    Event date: 2004.8

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  • 28pXE-13 Cryogenic STM/STS observations of local electronic structures of the high-Tc superconductor : temperature dependence

    Mashima Hideki, Kinoda Go, Hitosugi Taro, Kondo Takeshi, Ikuta Hiroshi, Hasegawa Tetsuya

    Meeting abstracts of the Physical Society of Japan  2004.3  The Physical Society of Japan (JPS)

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    Event date: 2004.3

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  • 13aPS-13 Cryogenic STM/STS observations of impurity-doped Bi-2212 single crystals

    Fukuo N., Mashima H, Kinoda G., Hitosugi T., Shimada T., Shimizu K., Shimoyama J., Kishio K., Hasegawa T.

    Meeting Abstracts of the Physical Society of Japan  2004  The Physical Society of Japan

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  • 25pWD-7 First principles study of dopant structures on H-terminated Si(100) surface

    Suwa Y., Matsuura S., Hitosugi T., Heike S., Fujimori M., Kajiyama H., Onogi T., Hashizume T.

    Meeting abstracts of the Physical Society of Japan  2002.3  The Physical Society of Japan (JPS)

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  • Study of Ga atom migration on Si Surface by first principles charge analysis

    Suwa Y., Hitosugi T., Heike S., Matsuura S., Hashizume T., Watanabe S., Onogi T.

    Meeting abstracts of the Physical Society of Japan  2000.9  The Physical Society of Japan (JPS)

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    Event date: 2000.9

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  • 30p-S-5 Diffusion of Ga atoms on a H-Terminated Si Surface

    Suwa Y., Hitosugi T, Heike S., Matsuura S., Hashizume T., Watanabe S., Onogi T.

    Meeting abstracts of the Physical Society of Japan  1999.3  The Physical Society of Japan (JPS)

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    Event date: 1999.3

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  • Peierls distortion in dangling-bond structures fabricated on hydrogen-terminated Si(100)2×1 surface

    HITOSUGI T., HASHIZUME T., HEIKE S., ONOGI T., WATANABE S., HASEGAWA T., KITAZAWA K., LI Z.-Q, OHNO K., KAWAZOE Y.

    Meeting abstracts of the Physical Society of Japan  1998.9  The Physical Society of Japan (JPS)

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    Event date: 1998.9

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  • Theoretical Study of Diffusion of Ga atoms on a H-Terminated Si Surface

    SUWA Yuji, WATANABE Satoshi, ONOGI Toshiyuki, HITOSUGI Taro, HASHIZUME Tomihiro

    Meeting abstracts of the Physical Society of Japan  1998.9  The Physical Society of Japan (JPS)

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    Event date: 1998.9

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  • STM/STS studies of Dangling-bond Structures Fabricated on Hydrogen-terminated Si(100)2X1 surface

    HITOSUGI T., HASHIZUME T., HEIKE S., KAJIYAMA H., WADA Y., WATANABE S., HASEGAWA T., KITAZAWA K.

    Meeting abstracts of the Physical Society of Japan  1998.3  The Physical Society of Japan (JPS)

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    Event date: 1998.3

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  • ラボDXによる材料研究開発の革新 Invited

    一杉 太郎

    第133回触媒討論会特別シンポジウム  2025.3 

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  • 研究者を「自由に」、そして「創造的に」する新たな研究開発環境 Invited

    一杉 太郎

    第70回応用物理学会 春季学術講演会 シンポジウム  2023.3 

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  • 先端計測技術がシステム化されたデジタルラボラトリー Invited

    一杉 太郎

    日本学術振興会 R026 先端計測技術に関する委員会  2023.3 

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  • 実験室のデジタル化: その現状と展望 Invited

    一杉 太郎

    機能性フィルム研究会  2023.6 

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  • Autonomous thin-film synthesis and characterization system Invited

    Taro Hitosugi

    Joint APS/CNM workshop on "Synchrotron-Based Autonomous Scattering Studies of Synthesis and Processing" Organized by Argonne National Laboratory  2023.5 

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  • 「レーザー×システム化」が切り拓く表面・真空・界面科学 Invited

    一杉 太郎

    日本表面真空学会2023年度関東支部講演大会 「最新レーザー技術で拓く表面真空科学」  2023.4 

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  • 電気化学界面研究を切り拓く「マテリアル×デジタル」革新 Invited

    一杉 太郎

    日本学術振興会R025進薄膜界面機能創成委員会4月研究会  2023.4 

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  • High ionic conductivity at the interfaces of solid electrolytes and electrodes Invited

    Taro Hitosugi

    International Congress on Pure & Applied Chemistry (ICPAC Kota Kinabalu 2022)  2022.11 

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  • Autonomous solid-materials synthesis by machine learning and robotics Invited

    Taro Hitosugi

    11th International Workshop on Combinatorial Materials Science and Technology (COMBI 2022)  2022.9 

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  • Protons at the interfaces of oxide solid electrolytes and electrodes Invited

    Taro Hitosugi

    International Materials Congress 2022  2022.8 

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  • What should human researchers focus on in the era of artificial intelligence and robotics Invited

    Taro Hitosugi

    The 13th Multidisciplinary International Student Workshop (MISW 2022)  2022.8 

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  • 自律的実験技術が切り拓く新しい研究開発環境 Invited

    一杉 太郎

    高効率レーザープロセッシング推進コンソーシアム オープンセミナー  2023.2 

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  • ロボットと機械学習が科学的知見を発見する時代がやってきた Invited

    一杉 太郎

    RSJロボット工学セミナ  2023.7 

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  • サイバーとフィジカルが融合した化学・材料研究開発環境 Invited

    一杉 太郎

    第44回化学・材料インキュベーション研究会  2023.7 

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  • 薄膜電池の充電・放電状態を二値メモリーとして活用する Invited

    一杉 太郎

    固体イオニクス研究会 日本固体イオニクス学会  2023.7 

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  • Future prospects and challenges in a common data format for laboratory DX Invited

    2023.9 

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  • 研究開発のデジタル化に化学産業はどう対応すべきか: 協調領域と競争領域の設定 Invited

    一杉 太郎

    JACI 電子情報技術部会ナノフォトニクスエレクトロニクス交流会  2023.9 

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  • 大型実験施設×スパコン×デジタルが切り拓く新しい研究開発環境

    一杉 太郎

    CROSS、JASRI、RIST三機関連携シンポジュウム 「第9回大型実験施設とスーパーコンピュータとの連携利用シンポジウム」  2023.9 

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  • 実験室のシステム化:その世界的動向と展望 Invited

    一杉 太郎

    日本学術会議公開シンポジウム「研究の自動化とAIが切り拓く科学と社会」  2023.9 

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  • 機械学習・ロボット・研究者が協働するデジタル大型共用施設 Invited

    一杉 太郎

    令和5年度中性子産業利用報告会  2023.7 

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  • 機械学習とロボットを活用した材料研究戦略 Invited

    一杉 太郎

    東京大学 エネルギー総合学連携研究機構(CROCES)  2023.6 

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  • オープンサイエンスのための新しい研究開発環境: ロボット・機械学習・データの活用 Invited

    一杉 太郎

    日本学術会議 学術フォーラム オープンサイエンス、データ駆動型研究が変える科学と社会 ―G7コミュニケを読み解  2023.6 

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  • 「自律的」実験技術を活用したデータ収集と利活用 Invited

    一杉 太郎

    光機能材料研究会 第93回講演会「データサイエンスの今日的到達点と応用展開」  2023.6 

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  • Solid-state lithium thin-film batteries capable of fast charging Invited

    Taro Hitosugi

    IEEE Electron Device Society, Kansai Chapter IMFEDK 2019  2019.11 

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  • Quest for AI/Robot-driven Materials Research Invited

    Taro Hitosugi

    STAM 20th Anniversary Symposium “Open Science and Materials Research” hosted by NIMS (National Institute for Materials Science)  2019.11 

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  • Reducing the Interface Resistances in Solid-State Batteries Invited

    Taro Hitosugi

    2nd World Conference on Solid Electrolytes for Advanced Applications: Garnets and Competitors  2019.9 

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  • Low interface resistance in Solid-State Batteries Invited

    Taro Hitosugi

    Electrochemical Conference on Energy and the Environment: Bioelectrochemistry and Energy Storage (ECEE 2019)  2019.7 

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  • High ionic conductivity across solid electrolyte and electrode interfaces Invited

    Taro Hitosugi

    Materials Research Meeting (MRM) 2021  2021.12 

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  • Interface resistance in solid-state batteries Invited

    Taro Hitosugi

    23rd International Conference on Solid State Ionics (SSI23)  2022.7 

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  • High ionic conductivity at the interfaces of solid electrolytes and electrodes Invited

    Taro Hitosugi

    E-MRS  2022.6 

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  • Autonomous Thin-film Materials Synthesis by Machine Learning and Robotics Invited

    Taro Hitosugi

    Workshop on Advanced Machine Learning Techniques for Materials Discovery 2021  2021.7 

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  • Autonomous Materials Synthesis by Machine Learning and Robotics Invited

    Taro Hitosugi

    NSF-JST joint workshop on “Thermal Transport, Materials Informatics and Quantum Computing  2021.3 

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  • How artificial intelligence and robotics change the way of our research Invited

    Taro Hitosugi

    Tsinghua University, KAIST and the Tokyo Institute of Technology Campus Asia Special lecture  2021.1 

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  • Understanding the interfaces of solid electrolytes and electrodes for memristive devices Invited

    Taro Hitosugi

    MEMRISYS 2020 (4th international Conference on Memristive Materials, Devices & Systems)  2021.11 

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  • Reduction of Interface Resistance between Electrolyte and Electrode in Sulfide-Based All-Solid-State Batteries Invited

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  • How artificial intelligence and robotics change the way of our research? Invited

    Taro Hitosugi

    Matminer Singapore Series - combining ML/HPC and Robotics/Automation for Materials Innovation  2021.9 

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  • デジタルラボラトリーの世界的潮流 Invited

    一杉 太郎

    MIカンファレンス  2023.9 

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  • “物理気相法による薄膜成長 ~酸化物、水素化物合成からデジタル化まで~ Invited

    一杉 太郎

    応用物理学会秋季学術講演会 チュートリアル講演  2023.9 

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  • Autonomous Synthesis of Thin Films Using Machine Learning and Robots Invited

    Taro Hitosugi

    ICPAC Bali  2023.9 

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  • Autonomous synthesis of solid materials using machine learning and robots Invited

    Taro Hitosugi

    4th Nobel Turing Challenge Initiative Workshop  2024.2 

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  • 研究者ってどんな仕事?研究者って楽しいぞ Invited

    一杉 太郎

    メタバース工学部ジュニア講座  2023.12 

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  • 研究開発の進め方の変革: 機械学習やロボット技術をいかに活用するか Invited

    一杉 太郎

    日本電気計測器工業会 講演会  2024.6 

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  • 固体化学研究を進める方法の変革: データ・ロボット駆動科学の急発展 Invited

    一杉 太郎

    固体化学の新しい指針を探る研究会 第91回定例研究会 (電気化学会)  2024.5 

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  • 世界で自分にしかできないことはありますか?社会人としての個性をどのようにして創るのでしょう? Invited

    一杉 太郎

    東大in柏陽  2024.5 

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  • デジタルラボラトリーによる研究開発の加速:分析機器業界はいかにあるべきか? Invited

    一杉 太郎

    日本分析機器工業会(JAIMA) 人材育成プログラム  2024.5 

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  • サイバーとリアルが融合したものづくり Invited

    一杉 太郎

    ニューガラスフォーラム若手懇談会見学会  2024.7 

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  • 自動・自律実験の世界的潮流と将来展望 Invited

    一杉 太郎

    水素連携研究会 前期研究会  2024.6 

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  • 異分野融合のスゝメ: 機械学習・数理科学と材料科学の融合 Invited

    一杉 太郎

    第48回有機電子移動化学討論会・第18回有機電子移動化学若手の会  2024.6 

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  • データ・ロボット駆動科学の現状と将来展望 Invited

    一杉 太郎

    データ駆動コンソーシアム講演会(コンソーシアム会員向け)  2024.6 

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  • Expectations for instrument companies in an AI- and robot-driven R&D environment Invited

    2024.9 

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  • サイバーとリアルが融合した新研究開発環境 〜日本として何をすべきか?〜 Invited

    一杉 太郎

    NIMS特別セミナー  2024.9 

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  • 研究者ってどんな仕事? Invited

    一杉 太郎

    メタバース工学部 ジュニア講座  2024.8 

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  • サイバーとフィジカルが融合した研究開発環境: 世界的潮流と将来展望 〜 分析機器企業はどう変化すべきか〜 Invited

    一杉 太郎

    日本分析機器工業会 第一回 人財育成ワークショップ  2024.10 

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  • The rise of Data- and Robot-driven Materials Science Invited

    Taro Hitosugi

    10th International Symposium on Surface Science  2024.10 

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  • AIとロボットが化学実験を進めるってホント?! Invited

    一杉 太郎

    日本化学会 第14回 CSJ化学フェスタ2024  2024.10 

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  • サイバーとリアルが融合した研究開発環境の世界的潮流と将来展望 Invited

    一杉 太郎

    第85回応用物理学会秋季学術講演会  2024.9 

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  • アトムからビットへ、そして、ビットからアトムへ 〜データ・ロボット駆動科学の最前線〜 Invited

    一杉 太郎

    第20回ガラス産業連合会シンポジウム  2024.11 

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  • サイバーとリアルが融合した新しい材料開発環境 Invited

    一杉 太郎

    日本セラミックス協会会員サービス【プレミアム講演会】  2024.10 

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  • 機械学習とロボットを活用したセラミックス材料研究の新展開 Invited

    一杉 太郎

    Ceramics Japan展示会  2024.10 

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  • データ・ロボット駆動科学の世界的動向と展望 Invited

    一杉 太郎

    産業技術総合研究所 令和5年度第2回研究DXフォーラム  2023.9 

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  • 有機結晶におけるイオン伝導研究: 新概念構築とラボのデジタル化 Invited

    一杉 太郎

    第31回有機結晶シンポジウム (主催 日本化学会 有機結晶部会)  2023.11 

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  • 「電池×データ・ロボット駆動科学」の未来展望 Invited

    一杉 太郎

    第63回電気化学セミナー「蓄電池の未来ー学術・技術・人材育成の展望ー」  2023.10 

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  • 材料分野におけるデータ・ロボット駆動科学の最前線 Invited

    一杉 太郎

    第6回(2023年度第3回)透明酸化物光・電子材料研究会  2023.10 

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  • 情報技術とロボットが自律的に科学的知見を発見する時代がやってきた! Invited

    一杉 太郎

    豊田工業大学 情報技術研究センター シンポジウム  2023.10 

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  • Autonomous synthesis of thin films using machine learning and robots Invited

    Taro Hitosugi

    Materials Research Meeting (MRM) 2023  2023.12 

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  • データ・ロボット駆動科学における計測分析機器の新しい活用法(副題)新しい研究開発の進め方で研究開発を加速する Invited

    一杉 太郎

    JEOL(日本電子) 第16回 SEMユーザーズミーティング  2023.11 

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  • 研究者が常に新しいことにチャレンジし続けられる研究環境を作りたい Invited

    一杉 太郎

    2023年度第1回 ATF界面ナノ科学研究会  2023.11 

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  • データ・ロボット駆動科学を活用したセラミックス材料研究 Invited

    一杉 太郎

    第43回電子材料研究討論会  2023.11 

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  • データ・ロボット駆動科学が切り拓く材料研究 Invited

    一杉 太郎

    名古屋大学 工学研究科 応用物質化学専攻 セミナー  2023.12 

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  • 「産業化、ビジネス、マネタイズ」「マテリアル研究」で勝ち続けるためには Invited

    一杉 太郎

    第3回AIロボット駆動科学研究会  2025.3 

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  • Ultralow Interface Resistance at Solid-Electrolyte and Electrode Interfaces Invited

    Taro Hitosugi

    MRS Spring meeting  2018.4 

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  • Atomically-Engineered Interfaces in Solid-State Batteries Invited

    Taro Hitosugi

    2019 IEEE International Symposium on Applications of Ferroelectrics (ISAF) 9th International Conference on Electroceramics (ICE2019)  2019.7 

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  • Atomically Engineered Interfaces in Solid-state Batteries Invited

    Taro Hitosugi

    SKKU workshop on Materials Frontier Research  2019.1 

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  • Atomically Engineered Interfaces in Solid-state Batteries Invited

    Taro Hitosugi

    JSPS A3 Joint Seminar 2019  2019.1 

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  • Injecting knowledge on oxides into hydrides Invited

    Taro Hitosugi

    The 4th Korea-Japan Joint Symposium on Hydrogen in Material  2018.11 

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  • Transparent superconductor LiTi2O4 Invited

    Taro Hitosugi

    The 4th E-MRS and MRS-J Bilateral Symposium on advanced functional oxides and wide-band-gap semiconductors  2018.10 

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  • Ultrafast Charging of Solid-state Lithium Batteries: Introduction of Oxide Electronics to Battery Research Invited

    Taro Hitosugi

    Interfaces in Energy Materials" AIP Publishing Horizons conference  2018.4 

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  • Interface resistances in solid-state batteries Invited

    Taro Hitosugi

    The 2018 International Conference on Green Electrochemical Technologies and the 2018 Annual Meeting of Electrochemical Society of Taiwan  2018.11 

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  • 機械学習、ロボット、データを活用した研究現場とは? 〜私達はより創造的な仕事に取り組みましょう!〜 Invited

    一杉 太郎

    大学共同利用機関法人 高エネルギー加速器研究機構(KEK) 技術セミナー  2025.2 

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  • サイバーとリアルが融合した研究開発環境による研究の加速 Invited

    一杉 太郎

    第76回構造生物応用研究会  2025.1 

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  • Global Trends and Future Prospects for Data- and Robot-Driven Materials Science Invited

    2024.12 

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  • 固体イオニクス研究の未解決課題と将来展望 Invited

    一杉 太郎

    第50回 固体イオニクス討論会  2024.12 

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  • Self-driving Experiments Based on Machine Learning and Robots Invited

    Taro Hitosugi

    15th International Symposium on Atomic Level Characterizations for New Materials and Devices '24  2024.11 

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  • サイバーとリアルが融合した材料開発環境 Invited

    一杉 太郎

    令和5年度 分析イノベーション交流会  2025.2 

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  • Global Trends and Future Prospects for Digital Laboratories Invited

    2025.2 

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  • Global Trends and Future Prospects for Data- and Robot-Driven Science Invited

    2025.1 

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  • 機械学習、ロボット、研究者の協働で実現するデジタルラボラトリ Invited

    一杉 太郎

    日本計量機器工業連合会研究会  2025.1 

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  • 自律実験」と「データ」を活用した新しい研究開発法 Invited

    一杉 太郎

    マテリアルズインフォマティクスの最前線 日本化学会「R&D懇話会」  2025.2 

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  • データ・ロボット駆動科学の世界的潮流と将来展望 Invited

    一杉 太郎

    第8回FlowSTシンポジウム  2025.2 

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▼display all

Research Projects

  • Mathematical and simulation analysis towards establishing ion jamology

    Grant number:24H02203  2024.4 - 2029.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Transformative Research Areas (A)

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    Grant amount:\307840000 ( Direct Cost: \236800000 、 Indirect Cost:\71040000 )

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  • Ion Jamology: Materials design transformation by understanding non-equilibrium and collective ion flow

    Grant number:24A201  2024.4 - 2029.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Transformative Research Areas (A)

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    Authorship:Principal investigator 

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  • 分子結晶全固体電池の創製

    Grant number:JPMJCR22O4  2022 - 2027

    科学技術振興機構  戦略的な研究開発の推進 戦略的創造研究推進事業 CREST 

    一杉 太郎,館山 佳尚,守谷誠

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    Authorship:Principal investigator 

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  • マテリアル探索空間拡張プラットフォームの構築

    Grant number:JPMJMI21G2  2021 - 2025

    科学技術振興機構  戦略的な研究開発の推進 未来社会創造事業 探索加速型 

    長藤 圭介, 一杉 太郎, 小野 寛太, 知京 豊裕、牛久 祥孝

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    マテリアル研究開発の効率を上げるため,日本の強みである人の勘・コツ・経験を生かした新たなマテリアル探索手法「マテリアル探索空間拡張プラットフォーム」を構築する.材料探索スループット1,000倍をKPIとし,下記3つの柱をPOCに掲げる.電池材料を題材とする.1ハイスループット自律探索システム要素技術「つくる」:真空成膜を用いた自律実験システム「はかる」:自動結晶構造解析システム「ためる」:材料特性予測システム,2データ駆動/仮説駆動ハイブリッド型研究「わかる」:勘・コツ・経験に基づいてヒラメキを誘発する工程要素を「つくる」→「はかる」→「ためる」 各工程要素とデータでつなぐ機械学習等の仕組みを開発する.3ナレッジシェアリング
    データから得られるナレッジ,すなわち人のヒラメキを誘発しうる知識を研究開発機関、研究開発企業、計測器メーカなどと共有し,マテリアル研究開発エコシステムにつなげる.

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    J-GLOBAL

  • アナターゼ型TiO2薄膜を活用した低接触抵抗・高耐久性セパレータ表面処理技術の開発

    2021 - 2024

    新エネルギー・産業技術総合開発機構(NEDO)  燃料電池等利用の飛躍的拡大に向けた共通課題解決型産学官連携研究開発事業 

    一杉 太郎,山田 直臣

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  • Properties of thin films after applying ultrahigh pressure

    Grant number:20K21077  2020.7 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)  Grant-in-Aid for Challenging Research (Exploratory)

    Hitosugi Taro

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    Grant amount:\6370000 ( Direct Cost: \4900000 、 Indirect Cost:\1470000 )

    We aimed to synthesize new materials by combining "thin-film technology under vacuum" and "ultrahigh-pressure technology above 10 GPa," thereby opening the way for new materials research. These two techniques had been thought to be contradictory. Our challenge was to stabilize materials that are stable only under ultrahigh pressure, even at the ambient pressure.
    In this research, we worked on the following three items.(1) Develop technology to apply ultrahigh pressure to large thin films of the order of mm without damaging them. (2) Crystal growth of high-pressure phase α-AlO(OH) by the surface topotactic reaction on substrate single crystals. (3) Obtaining perovskite-type CaSiO3 under atmospheric pressure.

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  • トポロジカル超精密原子層物質の創成

    Grant number:JPMJCR20T3  2020 - 2025

    科学技術振興機構  戦略的な研究開発の推進 戦略的創造研究推進事業 CREST 

    越野 幹人,一杉 太郎,植村 卓史

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    Authorship:Coinvestigator(s) 

    原子層物質からなるナノリボン、2次元ネットワーク、3次元曲面物質等の幾何学的構造体「超精密原子層」を実現し、原子層トポロジカルバンドエンジニアリングの基礎を確立します。物性理論、有機化学、材料工学の研究者がチームを組み、トポロジカル物性を持つ超精密原子層を理論的に予言、多孔性金属錯体(MOF)のナノ空間技術を用いて創成、革新的な物性を持つデバイスを実現します。

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    J-GLOBAL

  • HYDROGENOMICS: Creation of Innovative Materials, Devices, and Reaction Processes using Higher-Order Hydrogen Functions

    Grant number:18H05514  2018.6 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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    Grant amount:\170560000 ( Direct Cost: \131200000 、 Indirect Cost:\39360000 )

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  • Research Promotion on Hydrogenomics

    Grant number:18H05512  2018.6 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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    Grant amount:\120250000 ( Direct Cost: \92500000 、 Indirect Cost:\27750000 )

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  • Innovative environmental and energy materials based on atomic-scale oxide surface control

    Grant number:18H03876  2018.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Hitosugi Taro

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    Grant amount:\43810000 ( Direct Cost: \33700000 、 Indirect Cost:\10110000 )

    The surfaces and interfaces of metal oxides are extremely important because battery and catalytic reactions occur at those sites. It is generally difficult to reveal the surface and interface electronic structures with atomic-level spatial resolution. Therefore, we have combined metal-oxide epitaxial thin-film technology with scanning tunneling microscopy (STM) to reveal the atomic structures and electronic states on the surfaces of metal-oxide thin films. In this study, the knowledge of the surfaces and interfaces is applied to environmental and energy materials. Specifically, we introduce solid-state physics perspectives into electrochemical research and explore materials and physical properties.

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  • Voltage-driven redistribution of lithium ions at solid electrolyte and electrode interfaces

    Grant number:16K14088  2016.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    Hitosugi Taro

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    Grant amount:\3770000 ( Direct Cost: \2900000 、 Indirect Cost:\870000 )

    All-solid-state lithium batteries are expected as next-generation batteries due to the safety, high energy density, and high power. However, the high interface resistance at the solid electrolyte and positive electrode interfaces hinder the application of all-solid-state lithium battery in the market. Therefore, it is necessary to clarify the origin of the high interface resistance and the distribution of lithium ions near the interface.
    Therefore, in this study, we investigated the lithium concentration distribution near the interface using Rutherford backscattering, nuclear reaction analysis, and neutron reflectivity measurement. We succeeded in the quantitative observation of the voltage-driven redistribution of lithium ions in solid electrolytes.

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  • Investigating the electronic structures of LaAlO3/SrTiO3 heterostructures on an atomic scale

    Grant number:26246022  2014.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    Hitosugi Taro, Shimizu Ryota, Okada Yoshinori, Shiraki Susumu

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    Grant amount:\36530000 ( Direct Cost: \28100000 、 Indirect Cost:\8430000 )

    Transition-metal oxides exhibit various functional properties not found in ordinary semiconductors. In recent years, with the rapid development of oxide-thin film growth technique, it has become possible to fabricate high-quality thin films and heterostructures. The atomic level control of surfaces and interfaces reveals a variety of novel physical properties and functionalities.
    To investigate the origins of such functional properties on an atomic scale, we developed a scanning tunneling microscope combined with a pulsed-laser deposition system, and studied the atomic and electronic structures of the surfaces of the transition-metal oxide films.

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  • 酸化物表面における特異なナノ構造の超高分解能STM測定

    Grant number:26106502  2014.4 - 2016.3

    日本学術振興会  科学研究費助成事業 新学術領域研究(研究領域提案型)  新学術領域研究(研究領域提案型)

    一杉 太郎

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    Grant amount:\5720000 ( Direct Cost: \4400000 、 Indirect Cost:\1320000 )

    酸化物薄膜表面の原子レベル空間分解能での電子状態計測は、機能性酸化物の表面/界面設計に向けて重要な知見を与える。本研究は透明な超伝導体、および、Liイオン電池材料としても重要なLiTi2O4に着目し、当研究室のメンバーとともにその薄膜の走査トンネル顕微鏡観察を進めた。
    その結果、スピネル構造を有する三元系酸化物においてはじめて原子像を観察し、さらに、4Kにおいて、最表面が超伝導状態であることを確認した。
    <BR>
    LiTi2O4薄膜をSrTiO3薄膜上に作製し、アニール条件を調整すると、原子レベルで平坦な表面が得られることを発見した。この表面において、周期的な輝点が観察されたため、精密な電子状態計測を行った。さらに、第一原理計算グループと共同研究を展開し、最表面の原子構造について、検討を行った。その結果、Tiが三角格子状に並んだ終端面になっていることがわかった。そして、表面ではバルク内部とは異なる超伝導状態になっている事を明らかにした。

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  • A transparent superconductor: mechanism and possible applications

    Grant number:26610092  2014.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    Hitosugi Taro

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    Grant amount:\3380000 ( Direct Cost: \2600000 、 Indirect Cost:\780000 )

    A framework is presented for the transparent conducting mechanism of transparent superconductor LiTi2O4. In the Bardeen-Cooper-Schrieffer (BCS) framework, achieving high superconducting transition temperature requires a large carrier density at the Fermi energy. This requirement prohibits the emergence of transparent superconductivity at high temperature, since the large carrier density leads to the optical absorption in the visible region. However, we here demonstrate transparent superconducting properties with a transition temperature exceeding 13 K in spinel LiTi2O4(111) epitaxial thin films. Although the LiTi2O4 have a very large carrier density exceeding 10 22 cm-3, the film shows high transmittance in the visible region. Photoemission and optical studies indicate a band gap of ~3.3 eV with free electrons populating up to 0.5 eV from the bottom of the conduction band. Electron transport measurements and optical analyses suggest the key role of electron effective mass.

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  • 酸化物ヘテロ界面物性の超低速ミュオン顕微鏡測定

    Grant number:26108702  2014.4 - 2016.3

    日本学術振興会  科学研究費助成事業 新学術領域研究(研究領域提案型)  新学術領域研究(研究領域提案型)

    一杉 太郎

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    Grant amount:\8450000 ( Direct Cost: \6500000 、 Indirect Cost:\1950000 )

    金属酸化物同士の界面における様々な特異現象(超伝導、磁性、電荷移動、イオン移動等)に注目が集まっている。本研究は超低速ミュオンが有する高い深さ分解能を活用して、その界面現象の起源を明らかにすることを狙っている。
    <BR>
    本年度、固体電解質と金属電極界面におけるイオン移動について集中的に検討を行った。この界面では、固体電解質内に空間電荷層と呼ばれるイオン濃度が減少した領域が界面近傍に形成されることが知られている。しかし、この層が固体電解質/電極界面からどの程度の深さまで達するのか、また、どの程度のイオン濃度になるのか、定量的な研究は行われていない。
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    そこで、超低速ミュオン研究と補完する役割を持つ、核反応分析法(NRA)を活用し、Liイオン濃度の深さ分布について、検討を行った。その結果、界面から10マイクロメートルの深さまでイオン濃度が変調していることがわかった。そして、それは印加する電界によって変化することも明らかになった。これは従来の常識を覆す結果であり、今後も集中して検討を行う予定である。

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  • Restructuring materials design principles of d-electron based transparent conducting oxide

    Grant number:23686002  2011 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)  Grant-in-Aid for Young Scientists (A)

    HITOSUGI Taro

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    Grant amount:\25350000 ( Direct Cost: \19500000 、 Indirect Cost:\5850000 )

    Restructuring materials design principles of d-electron based transparent conducting oxide
    We have performed two studies: atomic-scale investigation of the electronic structure of oxide thin films and development of a new transparent conductor. For the former, we revealed electronic structures and atomic arrangement of oxide thin films and SrTiO_3 substrate. The latter study consists of unveiling the mechanism of transparent superconductivity found in LiTi_02O_4.

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  • 一次元酸化物ヘテロ構造の新規物性開拓

    Grant number:22015004  2010 - 2011

    日本学術振興会  科学研究費助成事業 特定領域研究  特定領域研究

    一杉 太郎

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    Grant amount:\2400000 ( Direct Cost: \2400000 )

    ペロブスカイト系遷移金属酸化物のナノ構造を作製するためには、高品質エピタキシャル成長技術が不可欠である。本研究では、表面原子が秩序を有して配列しているSrTiO3(001)-(√13×√13)再構成表面が、ナノ構造成長用基板として適していることを明らかにし、その上にSrTiO3、およびLaAlO3の成長を行った。
    ナノ構造を作製する際には、数百度-千度程度に基板を加熱し、酸素を最大で10^<-2>Torrまでチャンバー中に導入する。このような条件下でも上記再構成基板は安定であり、実際にSrTiO3ホモエピタキシャル極薄膜を作製し、界面付近における薄膜の初期成長過程について、原子スケール観察を行った。
    その結果、単結晶基板および薄膜第1層のいずれの表面においても明瞭な(√13×√13)構造の観察に成功した。この構造の最表面層がTiリッチになっていることを考慮すると、界面においてコヒーレントエピタキシーが実現していることが示唆される。このような基板を用いることにより、酸化物薄膜の成長初期状態が原子レベルで明らかになり、高品質薄膜作製につながると考えられる。
    そこで、次に、LaAlO_3をヘテロエピタキシャル成長させ、ナノ構造を作製することを試みた。5nm程度のアイランドを形成し、電子状態を原子レベル分解能でマッピングしたところ、界面に蓄積した電荷の影響を観察することに成功した。基板との界面における特徴的な物性は、近年、非常に注目を浴びており、原子レベルの空間分解能で探ることができたのは大きな進歩である。

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  • 局所相分離を利用した光・磁性変換

    Grant number:18655052  2006 - 2007

    日本学術振興会  科学研究費助成事業 萌芽研究  萌芽研究

    長谷川 哲也, 一杉 太郎

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    Grant amount:\3500000 ( Direct Cost: \3500000 )

    Nd1-xSrxMnO3はx<0.5で強磁性(FM)、x>0.5で反強磁性(AFM)を示す。そこで、PLD法により同薄膜を合成し、光-磁気変換現象について検討した。その結果、強磁性領域では、明瞭な光-磁気変換効果が観測された。光を遮断しても磁化が保持されることから、高温安定相である常磁性相、あるいは隣接する反強磁性相が微細なドメインとして存在し、これが光により最安定な強磁性相に転移したものと結論した。
    一方、反強磁性領域(x>0.5)でも、走査SQUID観察から自発磁化が観測された。これは、反強磁性モーメントのキャンティング、あるいは強磁性微粒子の分散によるものと考えられる。ここに紫外光を照射すると、強磁性相同様、磁化の増大とメモリ効果が観測された。いずれも場合も、光により磁化は増大したものの、走査SQUIDの分解能(〜数μm)の範囲では、磁区パターンに変化は見られなかった。従って、強磁性ドメインのサイズは、nmスケールであると予想される。
    磁性の変化とともに導電性も変化することが考えられたため、まずマイクロ波顕微鏡を用いて薄膜の局所的な導電性を評価する方法を開発した。測定試料と同じ基板上に同じ膜厚の組成傾斜ニオブ添加二酸化チタン薄膜を合成し、これを標準試料として用いることで、マイクロ波キャビティのQ値シフトから、対象とする薄膜の導電率を定量評価した。この手法をMn系材料に応用したが、光による導電性の変化は観測されなかった。

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  • Search for organic-inorganic pyroelectric photoconductors and their photoinduced phenomena

    Grant number:17360008  2005 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    SHIMADA Toshihiro, HITOSUGI Taro

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    Grant amount:\15980000 ( Direct Cost: \14900000 、 Indirect Cost:\1080000 )

    We investigated new phenomena induced by optical excitation of ferro and pyro electric materials. Materials for this purpose are also searched by using doping. First, we studied the growth of polar semiconductor molecule Alq3 thin films with laser irradiation. We found that the molecular crystal domains become aligned with laser polarization. In order to investigate the mechanism of this phenomenon, we varied the growth conditions and the polarization of the laser. Based on the experimental results, we constructed a model as follows. It is known that giant photovoltage occurs by photoexcitation of ferroelectrics. If similar phenomenon occurs, then it is presumable that polar molecules are attracted by the giant electric field and becomes aligned in one direction. Second, we investigated angular distribution of the laser-aligned epitaxial films but no dependence on the polarization of the excitation lights were observed. We collaborated with a ultrafast laser laboratory and fo0und tha the intramolecular energy transfer occurs very quickly, which can explain the polarization dependence. This result indicates that polar emission of organic LED is not expected from Alq3. It further indicates that the laser-alignment, in the thin film growth is not induced by ultrafast phenomena but by rather static mechanism, which is consistent with our model. As for the materials development, we attempted doping of chromium to ferroelectric GASH and confirmed that the ferroelectricity is not broken by doping. We also studied doping to oxide nanoparticles by laser ablation in dopant solutions, doping of nanocrystals to polymers. We confirmed that doping occurs with high efficiency.

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  • Development of transparent light emiting devices based on titanium dioxide

    Grant number:17550171  2005 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    FURUBAYASHI Yutaka, HITOSUGI Taro

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    Grant amount:\3000000 ( Direct Cost: \3000000 )

    (1) Investigation of transport properties for transparent conducting oxide (TCO), anatase Ti_<1-x>Nb_xO_2
    We investigated effective masses and scattering factors of carriers for epitaxial anatase Ti_<1-x>Nb_xO_2 films. Optical conductivity in visible and infrared region had a good agreement with Drude model. Effective masses with low carrier concentration are approximately 0.4 m_0 and increase rapidly with regard to carrier concentration. We found that an optical phonon scattering is dominant and scatterings by ionized impurities are suppressed, which is due to the high dielectric constant of anatase TiO_2.
    (2) Exploration of p-type TiO_2 by chemical substitution
    The first principle calculation suggested that yttrium (Y) substituted anatase TiO_2 is a possibly p-type semiconductor. Combinatorial-technology revealed the existence of anatase Ti_<1-x>Y_xO_2 films. However, all of these films were insulating and no sign of p-type properties were observed.
    (3) Optical and transport properties of anatase Ti_<0.97-y>Nb_0.03Si_yO_2
    In order to apply TCO anatase TiO_2 to optical devices, it is required to control refractive indices of a TCO itself, because of a suppression of energy loss caused by reflections in interfaces and on a surface. We confirmed that Si-substituted anatase Ti_<0.97-y>Nb_0.03Si_yO_2 has an effectively low refractive indices, while maintaining a low resistivity less than 10^<-3>Ωcm.
    (4) Positive Hall coefficient of strongly reduced TiO_<2-x>
    We confirmed that strongly reduced TiO_<2-x> films grown under hydrogen atmosphere have the same crystal structure as that of γ- Ti_3O_5, and positive Hall coefficient, with a high reproducibility. The absence of anomalous Hall effects suggests that the positive Hall coefficient is not due to magnetic impurities. Also, we found that positive Hall coefficient of γ-Ti_3O_5 films is possibly due to the slightly smaller effective mass of holes than that of electrons.

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  • 単一分子の光化学反応とナノケミストリの開拓

    Grant number:16710065  2004 - 2006

    日本学術振興会  科学研究費助成事業 若手研究(B)  若手研究(B)

    一杉 太郎

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    Grant amount:\3900000 ( Direct Cost: \3900000 )

    本年度は単一分子の物性を知る方法としてスピン偏極走査型トンネル顕微鏡(STM)の開発に取り組んだ。この装置の特徴は、超伝導性を示す物質をSTM探針として用いることである。この超伝導状態の探針を表面の構造や分子に近づけ、トンネルスペクトルを測定することにより、スピン偏極率を求めることができる。
    一般に、スピン偏極STMは磁性探針を用いるため、表面の磁化の向きに関する情報が得られるが、スピン偏極率を求めることができない。しかし、この超伝導探針を用いたSTMは局所的にスピン偏極率を測定することができるという大きな特徴を有している。これまで、この装置の開発に成功したグループは無い。
    本研究課題において今年度、Nbのワイアをケミカルエッチングして高分解能のSTM探針を得ることに成功した。我々のアプローチの独創的な点は、Nb探針先端の酸化物を除去する方法として電界イオン顕微鏡(FIM)を用いたことである。これにより、STM探針の表面にNbが出ている状態に調製することが可能となった。
    この成果により、今後トンネルスペクトルの信頼性が飛躍的に向上し、より正確なスピン偏極率を求めることが可能となる。さらに、STM探針としては原子分解能を有することが必要である。我々はこのNb探針を用いてSi(111)7x7表面の原子像を得ることに成功し、空間分解能の点でも優れていることを実証した。
    今後、得られた探針を低温環境下に置き、スピン偏極率の計測を試みる予定である。

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  • Nanoscale reactions assisted by electron tunneling

    Grant number:16310069  2004 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    HASEGAWA Tetsuya, SHIMADA Toshihiro, HITOSUGI Taro

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    Grant amount:\11900000 ( Direct Cost: \11900000 )

    We have studied nanoscale reactions using scanning tunneling microscope (STM) on C60 films, deposited on HO PG(0001) substrates by the MBE method. We investigated desorption and polymerization of C60 molecules initiated by the STM needle. We found that the desorption reaction occurs when the bias voltage is higher than 2 V. The probability of the reaction is abruptly increased with increasing bias voltage. We speculate that the wavefunction of LUMO+1 in C60 overlaps with that of STM tip to form a bonding orbital, resulting in desorption of C60 from the surface. When repeating XY scan with a bias voltage of 2.5 V and tunneling current of 50 pA, some C60 molecules were found to be imaged with darker contrast. This is understandable by assuming that a surface COO molecule reacts with underneath ones and the distance between two molecules becomes shorter. In the darker molecules, we could see internal structures by STM, indicating that the molecule no longer rotates. This observation supports the above mentioned "vertical polymerization" mechanism.
    Scanning tunneling spectroscopy (STS) is a powerful to investigate local electronic structures in an atomic scale. However, STM measurements at room temperature suffer from thermal smearing, so that it is impossible to obtain energy resolution higher than 〜20 meV. In order to achieve higher energy resolution, we have developed a low temperature STM/STS instrument. We confirmed that the STM/STS has nano-scale spatial resolution together with high energy resolution of~0.1 meV from measurements of superconducting materials. Finally, we have applied the STM/STS to atomic scale observations of polymerized C60 molecules.

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  • 微小磁気プローブを用いた磁性半導体の磁区構造解明

    Grant number:16031205  2004 - 2005

    日本学術振興会  科学研究費助成事業 特定領域研究  特定領域研究

    長谷川 哲也, 一杉 太郎

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    Grant amount:\4100000 ( Direct Cost: \4100000 )

    磁性半導体の磁区構造を直接評価するため、低温で動作する磁気力顕微鏡装置(MFM)の開発を行なった。
    低温MFMの場合、冷却効率を向上させるため、MFMヘッド部を極力小型化する必要がある。カンチレバーの制御方式には通常光テコ方式が使用されるが、これではヘッド部周囲にスペースを要するため、本研究では自己検知型カンチレバーを採用した。また、低温ではピエゾ素子の圧電定数が低下し、走査範囲が限定される。そこで、2つの円筒型ピエゾを組み合わせ、極低温でもμm角以上の走査範囲を実現した。
    本装置では、磁場印加による磁区構造の変化を観測するため、MFMの外部に電磁石を設置した。同電磁石により、水平方向に最大3kOeの磁場を印加することが可能である。また、MFMヘッド(試料面は垂直方向)を慣性駆動の回転ステージの上に装着した。従って、ステージを回転することにより、試料面に対する磁場の角度を0〜90度の間で任意に設定できる。
    MFMでは、磁気力の外に、表面の凹凸の情報も同時に観測する。これらを分離するため、以下のような方法を用いた。まず、探針を試料に接近させ、近距離力である原子間力を検知しつつ、表面のトポグラフィー(凹凸像)を測定する。続いて、探針を離した上体に固定し、先に測定した凹凸に応じて探針を上下させ、凹凸の影響を除外しつつ、遠距離力である磁気力を観測する。
    まず上記低温MFMの性能を確認するため、ハードディスクの観察を行った。その結果、液体窒素温度でも明瞭な磁気ビットパターンを観測した。同イメージより、空間分解能は100nm以下と見積もられる。つづいて、低温で強磁性転移を示すマンガン酸化物の磁区観察を行った。その結果、200nm程度の磁区構造を始めて捉えることに成功した。

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  • 走査型トンネル顕微鏡を応用したナノケミストリー

    1996

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    Grant type:Competitive

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  • oxide thin films scanning tunneling microscope

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  • 表面界面物性、酸化物、透明導電体

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  • 酸化物に関する研究

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    Grant type:Competitive

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  • 二酸化チタンをベースとする透明導電体

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  • 酸化物の電気的・磁気的特性に関する研究

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