Updated on 2026/03/01

写真a

 
MURAKAMI YOICHI
 
Organization
Institute of Integrated Research Laboratory for Zero-Carbon Energy Professor
Title
Professor
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Degree

  • Doctor (Engineering) ( 2005.3   The University of Tokyo )

Research Areas

  • Nanotechnology/Materials / Organic functional materials

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Thermal engineering  / Molecular thermal engineering, Thermo-fluidics, Liquid thermoelectrics

  • Nanotechnology/Materials / Nanomaterials  / Covalent Organic Frameworks (COFs)

Education

  • Massachusetts Institute of Technology   Department of Mechanical Engineering   Visiting Graduate Student with Goverment Scholarship

    1999.9 - 2000.5

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    Country: United States

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  • The University of Tokyo   Graduate School of Engineering   Ph.D. from Department of Mechanical Engineering

    2005.3

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    Country: Japan

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  • Tokyo Institute of Technology   School of Engineering   Department of Mechano-Aerospace Engineering

    1998.3

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    Country: Japan

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  • Tokyo Institute of Technology   Graduate School of Science and Engineering   Department of Mechanical Sciences and Engineering

    2001.3

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    Country: Japan

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Research History

  • Institute of Science Tokyo   Institute of Integrated Research   Professor

    2024.10

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    Country:Japan

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  • Tokyo Institute of Technology   Laboratory for Zero-Carbon Energy, Institute of Innovative Research   Professor

    2022.4 - 2024.9

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    Country:Japan

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  • Japan Science and Technology Agency (JST)   PRESTO   Researcher

    2018.10 - 2022.3

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    Country:Japan

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  • Tokyo Institute of Technology   School of Engineering, Department of Mechanical Engineering   Associate Professor

    2016.4 - 2022.3

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    Country:Japan

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  • Tokyo Institute of Technology   School of Science and Engineering, Department of Mechanical Sciences and Engineering   Associate Professor

    2014.4 - 2016.3

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    Country:Japan

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  • Tokyo Institute of Technology   Global Edge Institute   Assistant Professor (Tenure Track)

    2009.4 - 2014.3

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    Country:Japan

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  • The University of Tokyo   Graduate School of Engineering (GMSI/G-COE)   Specially Appointed Associate Professor (Lecturer)

    2009

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    Country:Japan

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  • The University of Tokyo   Graduate School of Engineering, Department of Chemical System Engineering   JSPS Postdoctoral Research Fellow

    2006 - 2009

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    Country:Japan

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  • Rice University   Department of Electrical and Computer Engineering   Postdoctoral Research Fellow (Visiting Scientist)

    2006 - 2007

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    Country:United States

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  • The University of Tokyo   Graduate School of Engineering, Department of Mechanical Engineering   JSPS Postdoctoral Research Fellow

    2005 - 2006

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    Country:Japan

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  • The University of Tokyo   Graduate School of Engineering, Department of Mechanical Engineering   JSPS Research Fellow (DC2)

    2004 - 2005

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    Country:Japan

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  • Sony Corporation   VAIO Laptop PC Division   Mechanical and Thermal Engineer

    2001 - 2002

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    Country:Japan

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Professional Memberships

Papers

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MISC

  • Photon upconversion with organic molecules

    Material stage   12 ( 12 )   60 - 64   2013.3

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  • Exciton diffusion in individual single-walled carbon nanotubes

    MORITSUBO S, MURAI T, SHIMADA T, MURAKAMI Y, CHIASHI S, MARUYAMA S, KATO YUICHIRO K

    応用物理学会学術講演会講演予稿集(CD-ROM)   72nd   ROMBUNNO.29P-N-4   2011.8

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    Language:English  

    J-GLOBAL

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  • A meritorious deed of Werner Heisenberg (1901-1976)

    MURAKAMI Yoichi

    Journal of the Heat Transfar Society of Japan   50 ( 212 )   36 - 45   2011.7

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  • Phonon Conductions

    MURAKAMI Yoichi

    Journal of the Heat Transfar Society of Japan   50 ( 211 )   5 - 11   2011.4

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  • A meritorious deed of Louis de Broglie (1892-1987)

    MURAKAMI Yoichi

    Journal of the Heat Transfar Society of Japan   49 ( 208 )   52 - 57   2010.7

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  • 21pGQ-7 Magneto-absorption Spectra of PFO-single Walled Carbon Nanotubes under Ultra-high Magnetic Field by the Gaint Single-Turn Coil Method

    Suzuki U., Shen R., Kojima E., Matsuda Y., Murakami Y., Maruyama S., Yokoi H., Takeyama S.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   883 - 883   2010.3

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

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  • A meritorious deed of Niels Bohr (1885-1962)

    MURAKAMI Yoichi

    Journal of the Heat Transfar Society of Japan   49 ( 206 )   25 - 29   2010.1

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  • Photoconductivity measurements on individual single-walled carbon nanotube FETs

    MURAI T, MORITSUBO S, SHIMADA T, MURAKAMI Y, MARUYAMA S, KATO Y. K

    応用物理学会学術講演会講演予稿集   70th ( 1 )   462   2009.9

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  • Photoluminescence from carbon nanotubes suspended over trenches of various widths

    MORITSUBO S, MURAI T, SHIMADA T, MURAKAMI Y, MARUYAMA S, KATO Y

    応用物理学会学術講演会講演予稿集   70th ( 1 )   444   2009.9

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  • 26pYC-8 Magneto-optical absorption study of PFO-single walled carbon nanotubes under high pulse magnetic fields

    Suzuki H., Shen R., Miyauchi Y., Shiomi J., Maruyama S., Kojima E., Takeyama S.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   759 - 759   2009.8

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  • 30aYH-10 Environmental Effect on the UV Optical Absorption of Single-Walled Carbon Nanotubes

    Murakami Yoichi, Maruyama Shigeo

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   861 - 861   2009.3

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  • 28pPSA-14 Magneto-optical near-infrared absorption study of micelle-wrapped single-wall carbon nanotubes under ultra high pulse magnetic fields

    Suzuki H., Otsubo Y., Shen R., Kojima E., Takeyam S., Murakami Y., Miyauchi Y., Shiomi J., Maruyama S.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   739 - 739   2009.3

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  • 20pTC-1 Photoluminescence spectroscopy of carbon nanotubes dispersed with fluorine polymers

    Murakami Yoichi, Fukushima Takanori, Okubo Tatsuya, Maruyama Shigeo

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   735 - 735   2008.8

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  • カーボンナノチューブのCVD生成 (特集 カーボンナノチューブが拓く新世代)

    丸山 茂夫, 村上 陽一

    ケミカルエンジニヤリング   53 ( 5 )   359 - 362   2008.5

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    Language:Japanese   Publisher:化学工業社  

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  • 21aRC-8 Environmental effect on photoluminescence of carbon nanotubes

    Ohno Y., Iwasaki S., Murakami Y., Kishimoto S., Maruyama S., Mizutani T.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   850 - 850   2007.8

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  • 21aRC-6 Temperature dependence of photoluminescence spectra and spectral diffusion phenomena in a single-walled carbon nanotube

    Matsuda K., Inoue T., Murakami Y., Maruyama S., Kanemitsu Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   850 - 850   2007.8

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  • 19pRA-2 Exciton-exciton interactions in a single-walled carbon nanotube

    Matsuda K., Inoue T., Murakami Y., Maruyama S., Kanemitsu Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   828 - 828   2007.2

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  • 24pYB-3 Origin of photoluminescence spectrum fluctuations in single SWNTs at low temperatures

    Inoue T., Matsuda K., Kanemitsu Y., Murakami Y., Maruyama S.

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   683 - 683   2006.8

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  • 27aUA-2 Photoluminescence spectra and properties of single SWNTs at low temperatures

    Inoue T., Matsuda K., Kanemitsu Y., Murakami Y., Maruyama S.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   805 - 805   2006.3

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  • 27aUA-1 Chirality-dependent environmental effect on photoluminescence in carbon nanotubes

    Ohno Y., Iwasaki S., Murakami Y., Kishimoto S., Maruyama S., Mizutani T.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   805 - 805   2006.3

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  • Bulk ACCVD Generation of SWNTs with Narrow Chirality Distribution

    MARUYAMA SHIGEO, MIYAUCHI YUHEI, SHIMADA TAKASHI, MURAKAMI YOICHI, SATO KENICHI, OZEKI YUJI, YOSHIKAWA MASAHITO

    フラーレン・ナノチューブ総合シンポジウム講演要旨集   30th   68   2006.1

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  • C113 Influence of the Co/Mo Ratio on the Single-walled Carbon Nanotube Synthesis from Carbon Monoxide

    Nishii Toshiaki, Murakami Yoichi, Noda Suguru, Sugime Hiroshi, Masuyama Naoto, Maruyama Shigeo

    Procee[d]ings of Thermal Engineering Conference   2005   97 - 98   2005.11

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    Co and Mo are often used as catalysts for the catalytic chemical vapor deposition (CCVD) synthesis of single-walled carbon nanotubes (SWNTs) on a substrate. In this study, the influence of the Co/Mo ratio on the SWNT synthesis from carbon monoxide under atmospheric pressure was evaluated by the combinatorial method, using a library of sputter-doposited Co and Mo patterns.

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  • C114 Polarization dependence of the optical absorption of single-walled carbon nanotubes

    Murakami Yoichi, Maruyama Shigeo

    Procee[d]ings of Thermal Engineering Conference   2005   99 - 100   2005.11

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    Polarization dependence of the optical absorption of single-walled carbon nanotubes (SWNTs) is determined from the investigation of vertically aligned SWNT film for energy range 0.5-6 eV. It is found that UV absorption of SWNTs is made up of two peaks at 4.5 and 5.25 eV, which exhibit remarkable and different dependencies on incident light polarization. We developed an analytical pathway to determine nematic order parameter of a vertically aligned SWNT film utilizing the collinear absorption peak at 4.5 eV, and subsequently determined the bare (i.e. intrinsic) optical absorption cross-sections of SWNTs for both parallel and perpendicular light polarizations.

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  • 19pYF-7 Polarization and Carrier Relaxation Dynamics in Vertically-Aligned Single Walled Carbon Nanotubes

    Hashimoto Y., Murakami Y., Maruyama S., Kono J.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   684 - 684   2005.8

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  • 20pPSB-15 Photolumlnescence spectra and optical properties of an Individual single-walled carbon nanotube

    Inoue T., Matsuda K., Kanemitsu Y., Miyauchi Y., Murakami Y., Maruyama S.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   597 - 597   2005.8

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  • Optical Absorption Properties of Single-Walled Carbon Nanotubes

    MURAKAMI Yoichi, EINARSSON Erik, EDAMURA Tadao, MARUYAMA Shigeo

    13 ( 4 )   19 - 20   2005.7

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  • 垂直配向したカーボンナノチューブを用いたモード同期光ファイバレーザ

    井上悠介, 山下真司, 丸山茂夫, 村上陽一, 矢口寛, 小竹智晴, S. Y. Set

    2005年電子情報通信学会総合大会, 大阪大学豊中キャンパス, 大阪   no.C-4-23, 2005年3月21-24日.   2005.3

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  • Mode-locked fiber lasers using vertically aligned carbon nanotubes directly synthesized onto substrates Reviewed

    Y. Inoue, S. Yamashita, S. Maruyama, Y. Murakami, H. Yaguchi, T. Kotake, S. Y. Set

    Conf. on Optical Fiber Communications (OFC2005), Anaheim, CA   no. OFJ3, 6-11 Mar. 2005.   2005.3

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    Language:English   Publishing type:Research paper, summary (international conference)  

    DOI: 10.1109/OFC.2005.193130

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  • Fabrication and Characterization of FETs of Fullerene-Encapsulating Carbon Nanotubes

    OHNO Y, KUROKAWA Y, SHIMADA T, ISHIDA M, MURAKAMI Y, SAKAI A, KISHIMOTO S, MARUYAMA S, SHINOHARA H, MIZUTANI T

    Technical report of IEICE. SDM   104 ( 625 )   5 - 10   2005.1

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    Carbon nanotubes encapsulating fullerenes "peapods" have been synthesized directly on SiO_2/Si substrates. After singe-walled carbon nanotubes (SWNTs) were grown on a SiO_2/Si substrate by CVD technique, the caps of the SWNTs were opened by annealing in dry air. Then, fullerene doping into the SWNTs was performed by vapor phase doping technique. Encapsulations of C_<60> and Gd@C_<82> were confirmed by TEM. From Raman scattering spectroscopy of synthesized peapods, the smallest diameters of the SWNTs capable of fullerene encapsulation were estimated to be 1.28nm for C_<60> and 1.43nm for Gd@C_<82>. Gd@C_<82>-peapod FETs were fabricated by using the peapod synthesized directly on SiO_2/Si substrate. The bandgap of the peapod was estimated to be∿100meV from the temperature dependence of the drain current.

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  • Temperature Measurements of Single-walled Carbon Nanotubes by Raman Scattering

    S Chiashi, Y Murakami, Y Miyauchi, S Maruyama

    Thermal Science and Engineering   13 ( 4 )   71 - 72   2005

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  • Temperature measurement of single-walled carbon nanotubes by Raman scattering

    CHIASHI Shohei, MURAKAMI Yoichi, MIYAUCHI Yuhei, MARUYAMA Shigeo

    Procee[d]ings of Thermal Engineering Conference   2004   143 - 144   2004.11

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    Raman scatterings from various SWNT samples were measured at a wide range of temperatures (from 4 K to about 1000 K). With increase in sample temperature, both the Raman shift and the intensity of G-band of SWNTs decreased, while the peak width increased. Through the comprehensive calibration, the temperature of SWNTs can be measured by using the temperature dependence of Raman shift and the intensity in the G-band. The temperature distribution of SWNTs induced by the Raman excitation laser was measured with this temperature measurement technique of SWNTs.

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  • Growth of Vertically Aligned SWNT Films on Substrates and Their Optical Anisotropy

    MARUYAMA Shigeo, MURAKAMI Yoichi

    Journal of the Heat Transfar Society of Japan   43 ( 183 )   2 - 5   2004.11

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  • A Growth Mechanism for Vertically Aligned Single-Walled Carbon Nanotubes

    EINARSSON Erik, EDAMURA Tadao, MURAKAMI Yoichi, IGARASHI Yasuhiro, MARUYAMA Shigeo

    12 ( 4 )   77 - 78   2004.7

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  • 石英基板上に直接合成したカーボンナノチューブの可飽和吸収特性を用いたモード同期光ファイバレーザ

    井上悠介, 山下真司, 丸山茂夫, 村上陽一, 矢口寛, M. Jablonski, S. Y. Set

    2004年電子情報通信学会総合大会, 東京工業大学, 東京   no.C-4-20, 2004年3月22-25日.   2004.3

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  • Fluorescence spectroscopy of single-walled carbon nanotubes synthesized from alcohol.

    S Maruyama, Y Miyauchi, Y Hayashida, S Chiashi, Y Murakami

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   227   U1266 - U1266   2004.3

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  • 基板上へのピーポッドの直接合成

    黒川雄斗, 大野雄高, 嶋田行志, 村上陽一, 酒井朗, 石田将史, 岸本茂, 岡崎俊也, 丸山茂夫

    応用物理学関係連合講演会講演予稿集   51st ( 1 )   2004

  • Floated Catalytic CVD Generation of SWNTs from Alcohol

    CHIASHI Shohei, MURAKAMI Yoichi, MIYAUCHI Yuhei, EDAMURA Tadao, MARUYAMA Shigeo

    Procee[d]ings of Thermal Engineering Conference   2003   21 - 22   2003.11

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    We have proposed the new catalytic CVD generation technique of SWNTs from alcohol. By using alcohol as a carbon source, high-purity SWNTs were produced at relatively low temperature (550∿900℃). Here, using ferrocene as a precursor of floated iron catalyst clusters, high-purity SWNTs were generated from alcohol. Vapor of ferrocene ethanol solution was injected into a quartz tube, which was heated by an electronic furnace. Keeping the pressure of quartz tube at about 200-400 Torr, black soot was collected at a trap located at downstream of quartz tube. Raman scattering, TEM, SEM and TGA showed the generation of high-quality SWNTs, at low gas flow velocity (about 1 cm/s) and with Ar gas buffer. This simple technique is expected to be an efficient low-cost generation technique of bulk SWNTs.

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  • Near Infrared Spectroscopic Determination of Chirality Distribution of Single-Walled Carbon Nanotubes

    Maruyama Shigeo, Miyauchi Yuhei, Chiashi Shohei, Murakami Yoichi, Edamura Tadao

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   744 - 744   2003.8

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  • A13-103 DIRECT SYNTHESIS OF SINGLE-WALLED CARBON NANOTUBES ON SILICON AND QUARTZ BASED SYSTEMS :

    Murakami Yoichi, Chiashi Shohei, Miyauchi Yuhei, Maruyama Shigeo

    International Symposium on Micro-Mechanical Engineering : ISMME   2003   37 - 44   2003

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    A new technique of synthesizing single-walled carbon nanotubes (SWNTs) directly on the surface of Si and quartz substrates is introduced in this report. This technique adopted a liquid based dip-coat method to mount very small amount of catalyst metals on the surface of the substrates with using Mo/Co bimetallic acetate solution. Merits of this approach lie in its easy, costless, and geometry-flexible nature compared with conventional sputtering and deposition approaches. We used alcohol catalytic CVD (ACCVD) method that can produce relatively high quality SWNTs even at low temperature down to 600℃. This low temperature process contributes to the prevention of agglomeration of catalytic metals on the surface and chemical reaction between catalytic metal and silicon, which helps us to eliminate any kind of intermediating support materials. Thereby synthesized SWNTs on Si and quartz substrates under various CVD conditions are characterized by means of SEM, TEM, Raman scattering, and optical absorbance measurements. The underlying reasons of why our experimental procedure and choice of catalyst worked for the synthesis of SWNTs are discussed through comparative studies. In the end of this report, some possible application of this technique is stated.

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  • メソポーラス薄膜を利用した高純度単層カーボンナノチューブの低温合成

    大久保 達也, 山北 茂洋, 村上 陽一, 丸山 茂夫

    化学工学会 研究発表講演要旨集   2003 ( 0 )   503 - 503   2003

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    Language:Japanese   Publisher:公益社団法人 化学工学会  

    DOI: 10.11491/scej.2003f.0.503.0

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Awards

  • 企業特別賞

    2020.11   総務省 異能vation  

    村上 陽一

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  • 講演論文表彰

    2020.10   日本機械学会 熱工学部門  

    村上 陽一, 元岡 歩, 新見 一樹, 海寳 篤志, 清柳 典子

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  • 学術賞

    2015.6   日本伝熱学会  

    村上 陽一

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  • 文部科学大臣表彰 若手科学者賞

    2010  

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    Country:Japan

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  • The Young Scientists' Prize, The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology

    2010  

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  • 奨励賞

    2006   日本伝熱学会  

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  • Young Scientist Award

    2006  

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  • Iijima Award

    2005  

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  • 第一回 飯島賞

    2005  

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    Country:Japan

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  • Young Scientist Award for the Presentation of an Excellent Paper

    2003  

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  • Student Award for the Presentation of an Excellent Paper

    2003  

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  • 講演奨励賞

    2003   応用物理学会  

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  • 日本伝熱シンポジウム 学生優秀プレゼンテーション賞

    2003  

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Research Projects

  • 共有結合性ナノ骨格多孔体を用いた革新的なCO2分離材料の創出と熱工学的性質の解明

    Grant number:24KF0149  2024.10 - 2027.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    村上 陽一, PAUL RATUL

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    Grant amount:\2300000 ( Direct Cost: \2300000 )

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  • 共有結合分子骨格系を用いた新世代CO2吸収材の創出とミクロ-マクロ熱学術の構築

    Grant number:23H00165  2023.4 - 2028.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    村上 陽一, 植草 秀裕, 道信 剛志

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    Grant amount:\47320000 ( Direct Cost: \36400000 、 Indirect Cost:\10920000 )

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  • 超高秩序分子骨格系を用いた新世代の全固体電池創出と新融合領域創成

    Grant number:22K18286  2022.6 - 2027.3

    日本学術振興会  科学研究費助成事業  挑戦的研究(開拓)

    村上 陽一, 庄子 良晃

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    Grant amount:\25350000 ( Direct Cost: \19500000 、 Indirect Cost:\5850000 )

    カーボンニュートラル社会、超スマートエネルギー社会の実現のため、高性能で高信頼な二次電池の創出が望まれている。近年、化学分野では、共有結合性有機骨格 (Covalent Organic Framework, COF)というナノスケールの周期構造と多孔性をもつ固体系が、多くのユニークな特長と多彩な応用可能性により注目を集めている。本研究は、未だ存在せず、高性能が期待できる超高秩序な分子骨格をもつ3次元COFを用いた新世代の全固体電池の創出に挑戦する。具体的に、本研究は以下2点を目的とする。(i) 超高秩序分子骨格系を用いた新世代の全固体電池創出を創出し、社会と産業の発展に貢献すること。(ii) 学術が未形成な超高秩序分子骨格系におけるイオン輸送の学理を開拓・究明し、分子熱流体工学と化学との新たな融合領域を創成すること。
    二年度目である当年度は、応募時の研究調書に記載したアイデアであるポリエチレングリコール(PEG)鎖をもつ新規COFの開発と特性評価を完了させ、最大の難関だった結晶構造決定に成功し、成果を化学の著名誌であるJournal of the American Chemical Societyから出版した(2024年1月)。本成果はCOFで初めて三種類の構造異性体を制御的に生成したもので、骨格異性体間の熱力学的な差異を解明し、ナノ骨格系の基礎学術に新たな知見をもたらした。一方、当該COFではナノ孔がPEG側鎖で閉塞される問題が判明したため、当年度は様々な種類のリチウムイオン伝導性を与えるビルディングブロック分子(COFの原料分子)を新たに選定し、それらを用いて新COFの創出に挑戦した。さらに、COFの二次電池応用を進める上で基礎的理解が不可欠なCOFの物質導入特性や熱伝導特性をCOF-300という典型的な三次元COFを用いて解明し、その成果を2023年8月に論文出版した。

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  • Creations of high-performance upconversion crystal systems and their scientific fundamentals based on molecular thermal engineering

    Grant number:20H02082  2020.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Murakami Yoichi

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    Grant amount:\17680000 ( Direct Cost: \13600000 、 Indirect Cost:\4080000 )

    In broad light-energy conversions including photocatalysts and photovoltaics, light with wavelengths longer than the material's threshold wavelength cannot be used in principle, which fundamentally limits their conversion efficiencies. This research is for photon upconversion (UC), which converts unused long-wavelength light into usable shorter-wavelength light. Most conventional UC materials are solutions in organic solvents and are flammable, volatile, and toxic, making them far from real applications. Additionally, it cannot be used in the presence of oxygen, has low efficiency, and requires high-intensity incident light. This research has completely resolved these problems, by creating a new concept of a binary solid-solution crystal formed by thermodynamic driving force; the developed materials can be used in the air, and it can be used with irradiation light of lower intensity than sunlight. We have created a revolutionary crystalline material system that efficiently performs UC.

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  • Creation of high efficiency photon upconversion organic film/materials achieved by controlling thermal factors

    Grant number:17H03183  2017.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Yoichi Murakami

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    Grant amount:\16640000 ( Direct Cost: \12800000 、 Indirect Cost:\3840000 )

    This KAKENHI project pertains to the technology of photon upconversion (UC) that converts low energy photons (longer-wavelength lights) into higher energy photons (shorter-wavelength lights). In this project, creations of solid-form (crystals, poly-crystalline films) UC materials were pursued. Specifically, high-efficiency and stable organic solids was pursued by actively controlling thermal factors such as temperature and thermodynamic variables. Consequently, development of organic solids that emits clearly eye-recognizable UC photons were achieved. Furthermore, properties of the developed samples were elucidated by measurements and the mechanism of the sample stability was investigated and understood. Finally, the factors governing photo-stability of UC molecules against continuous photo-irradiation, which is a crucial issue related to the purpose of this research, were investigated with liquid UC samples and the fundamental governing mechanism have been successfully elucidated.

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  • Development of photon upconverters with high efficiency based on elucidations of the mechanisms that control the efficiency of intermolecular energy transfer

    Grant number:26709010  2014.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (A)

    Murakami Yoichi

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    Grant amount:\23660000 ( Direct Cost: \18200000 、 Indirect Cost:\5460000 )

    In photovoltaics and photocatalysts that convert the solar energy, lights that have longer wavelength than the threshold wavelength of each system is presently unused and wasted. This is because photons with lower energy than the bandgap energy of the material are not absorbed by it. If such unusable below-bandgap photons can be converted to useable above-bandgap photons, this limitation would be avoided. Such conversion that raises incident photon energy is called “photon upconversion (UC)”. This research was carried out to pursue understandings on the dictating mechanism of UC efficiency and to explore and develop new material that exhibit higher UC efficiency.

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  • 分子ダイナミクス研究に基づくイオン液体中における光アップコンバージョン機構の解明

    Grant number:14F04365  2014.4 - 2016.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    村上 陽一, DAS SUDHIR, DAS Sudhir

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    Grant amount:\2100000 ( Direct Cost: \2100000 )

    本研究は,様々な太陽光エネルギー変換において現在未利用となっている光スペクトル部分を利用可能にする光アップコンバージョン(UC)に関する.本研究はUC効率の支配メカニズムの解明を目的とし,その検証にイオン液体試料中における有機分子の回転ダイナミクスの研究が必要となっている.本研究課題は,当該実験手法の専門家である研究分担者と連携して進めるものである.分担者の母国における就職の急遽決定に伴い,本研究はやむをえず期間短縮して終了したが,以下の実績を得ることができた.
    1. 前年度から立ち上げを進めてきた「時間分解蛍光偏光解消法に基づく分子回転ダイナミクス」の計測システムを完成させた.
    2. 本計測において鍵となるのが,溶質分子回転ダイナミクスを支配する「溶媒-溶質相互作用」である.そのための溶質プローブ分子として,光物性がほぼ同一で溶媒(イオン液体)との相互作用のみが異なる分子の組を見い出したが,本年度はさらに,それらの分子が(回転ダイナミクスではないが,その予備実験として計測した)並進ダイナミクスに差があり,確かに両者間の「溶媒-溶質相互作用」に差があることを確認した.
    3. 本研究の広い意味の到達点は,より応用に適する性能・性質をもつ光アップコンバーターの創出にある.本課題はそのための基礎研究であることを踏まえ,より多様な分子回転ダイナミクスの制御パラメータを獲得するため,また,より応用に適するために,新規な媒体への拡張が望まれていた.分担者との議論を通じ,上記目的に叶う新規媒体の着想を得,試料の作製を試行し,工学的な進歩性・新規性を伴う試料の開発に成功した.これは現在,産学連携関係にある民間企業との共同特許出願(準備中)という形で結実している.
    本課題の目的は引き続き研究代表者によって追求されているが,分担者と連携した本課題の研究期間は,上記の目的に資する実り多いものであった.

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  • Creation of novel photon upconverters for realizing the enhancement of solar-energy utilization efficiencies

    Grant number:23686035  2011.4 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (A)

    MURAKAMI Yoichi

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    Grant amount:\13390000 ( Direct Cost: \10300000 、 Indirect Cost:\3090000 )

    When solar energy is converted to electrical power, hydrogen, and hydrocarbons by photovoltaics, photocatalysts, and artificial photosynthetic systems, respectively, photons with energies lower than a system-dependent threshold energy (or wavelengths longer than the threshold wavelength) are unused, which is limiting the solar conversion efficiency. Photon upconversion (UC) makes such presently wasted solar energy utilizable for energy conversion. In this study, ionic liquids have been used as media of the energy-carrying molecules, by which problems of the previous UC studies have been largely resolved. However, for further increase of the UC efficiency, an elucidation of inter-molecular energy transfer was imperative. This study has carried out studies on this point and acquired many knowledge that were previously unknown. By this, an important guideline for the improvement of UC efficiency has been for the first time obtained.

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  • Dispersion of bundle-aggregates of single-walled carbon nanotubes with aromatic molecules as dispersant

    Grant number:21860030  2009 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Research Activity Start-up

    MURAKAMI Yoichi

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    Grant amount:\2743000 ( Direct Cost: \2110000 、 Indirect Cost:\633000 )

    The essential purpose of this KAKENHI budget (Grant-in-Aid for Research Activity Start-up) is to launch the research environment just after the adoption as a new faculty member by the university where the investigator is presently working at. Single-walled carbon nanotubes have been attracting much attention recently as a novel material. Single-walled carbon nanotubes are, however, usually in the form of bundled aggregates because of the remarkable van-der Waals attractive interaction between the adjacent tube walls. Such aggregated bundles are unsuitable for many applications. The purpose of the project is to experimentally explore and develop the way to resolve the aggregated bundles into mono-dispersed tubes. Thus far, with using a certain type of aromatic polymer, single-walled carbon nanotubes have been densely dispersed into an organic solvent, forming a high-density carbon nanotube "gels". Owing to this start-up budget the research environment has almost been established and the research is now at a stage where the further development is expected.

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  • 単層カーボンナノチューブの光物性制御と光エネルギーデバイスの応用

    Grant number:06J09883  2006 - 2008

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    村上 陽一

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    Grant amount:\3400000 ( Direct Cost: \3400000 )

    本年度は(i)単層カーボンナノチューブのポスト分散処理による単一カイラリティ抽出とその詳細な分光分析,および(ii)カイラリティ制御合成に向けた結晶性ケイ酸塩表面構造を担体に利用した単層カーボンナノチューブの触媒化学気相成長の2テーマについて取り組んだ.
    前者については,シリカライト1(ゼオライト)およびRUB-18(層状シリケート)を触媒担体に選び,それらのナノスケール表面微細構造と触媒金属粒子との相互作用が化学気相合成される単層カーボンナノチューブの直径およびカイラリティに及ぼす影響を調べた.具体的には,CVD合成された単層カーボンナノチューブに対し顕微蛍光および顕微ラマン分光による分析を行い,生成されたナノチューブの量および直径・カイラリティを明らかにした.これにより,将来の触媒化学気相成長法による単層カーボンナノチューブのカイラリティ制御に向けた有意義な知見が得られた.
    後者については,(7,5)のカイラリティを持つ半導体単層カーボンナノチューブの選択抽出法を開発した.本研究では分散剤としてフルオレンポリマーを用い,溶媒にトルエンにカルボキシル基を含む添加物を添加する事により,直径が互いに非常に近い(6,5)チューブおよび(7,5)チューブの間の選択性を変化させ,後者のみを取り出す方法を開発した.さらに,このような光学的に高純度な試料に対して蛍光測定することにより,近赤外の最低バンド間遷移に起因する蛍光発光ピークの約140meV低エネルギー側に微弱な発光サイドバンドを見出した.このサイドバンドエネルギーの直径依存性を計測する事により,その物理的由来を光学不活性な励起子と光学フォノンの相互作用によるものと結論付けた.このような知見は,将来単層カーボンナノチューブの光デバイス応用を進める上で重要な基礎的知見となりうると考えられる.

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  • 単層カーボンナノチューブの基板上直接生成と光学・熱デバイスへの応用

    Grant number:04J10754  2004 - 2005

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    村上 陽一

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    Grant amount:\1900000 ( Direct Cost: \1900000 )

    本年度はまず前年度に得られた単層カーボンナノチューブ(以下,SWNT)の光学異方性に関する知見をまとめ,学術雑誌への投稿・発表を行った.具体的には,垂直配向単層カーボンナノチューブ膜(以下,VA-SWNT膜)のラマン散乱及び光吸収の異方性を見出し,特に後者においては,の紫外域(5.2eV付近)に存在するSWNT軸に直交方向の偏光により励起される光吸収を,グラファイトとの関連性及び過去の電子エネルギー損失分光の報告結果を基にしπプラズモン励起と帰着した.
    続いて,この帰着に対する確証実験として電気化学ポテンシャル及び周囲媒体の誘電率を変化させ,これらがVA-SWNT膜の光吸収スペクトルに及ぼす影響を計測した.これらの実験結果より,当該紫外吸収ピークがπプラズモンとした時に予測される挙動と一致した変化を示すことが確認された.以上の研究から得られた一連の知見はSWNTの光学応用を考える上で重要なものと考えられる.
    さらに,上記研究とは別に,VA-SWNT試料を温水中に挿入するとVA-SWNT膜がスムーズに基板から剥離される事を見出し,剥離された膜が垂直配向を保ったまま任意の基板表面に転写可能なことを示した.具体的には,本手法により,透明プラスチック膜やCPU等の電子回路上といった,耐熱性・化学安定性を有しない固体表面にもVA-SWNT膜の付着が可能となった.本研究で見出した剥離・再付着法は,VA-SWNT膜の応用可能範囲を大きく拡大するものと考えられる.
    以上まとめるに,本研究においては研究課題「単層カーボンナノチューブの基板上直接生成と光学・熱デバイスへの応用」を実施し,その遂行を通じてSWNTの光学及び熱応用の可能性が示されたと考えられる.

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