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Multiscale Analysis of Thermoelectric Properties of Carbon Nanotubes

Research Project

Project/Area Number 20K14661
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionThe University of Tokyo

Principal Investigator

Ohnishi Masato  東京大学, 大学院工学系研究科, 特任講師 (30782560)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsカーボンナノチューブ / 熱電変換 / フォノン / 分子動力学 / 原子グリーン関数 / カーボンナンチューブ / Van der Waals力 / 熱伝導率 / カーボンナノピーポッド / ゾーンフォールディング
Outline of Research at the Start

熱電変換素子は構造が簡単でメンテナンスが必要ないためIoTセンサーの電力源として期待されている.特にカーボンナノチューブ(CNT)は人体や配管等の曲率や可動部を有する対象への適用が期待される.本研究では,ひずみを用いたCNT熱伝導特性抑制,CNT接触部の熱・電子輸送特性の解析,CNTネットワークのマルチスケール熱電特性解析技術の開発を通し,CNT熱電デバイスの最適構造を提案する.

Outline of Final Research Achievements

A network structure of carbon nanotubes (CNTs) can be used as a flexible thermoelectric material because thermal conductivity decreases at CNT-CNT boundaries. In this study, it was revealed that when fullerenes are encapsulated within a CNT, a radial strain with a periodicity of approximately 1 nm is induced, and carbon atoms constituting the CNT vibrate according to the new periodicity. This phenomenon, known as the zone folding effect, has the effect of suppressing thermal conductivity by controlling the wave nature of atomic vibrations. This effect not only improves thermoelectric efficiency but also suggests the possibility of observing atomic vibrations exhibiting phenomena similar to optical interference effects. It is anticipated that the observation of new physical phenomena using fullerenes-encapsulated CNTs will be possible.

Academic Significance and Societal Importance of the Research Achievements

IoT技術を支えるためには無数のセンサが必要になる.CNTのような高い柔軟性を持つ熱電変換材料は,人体や曲率を有する構造物への適用が期待される.本研究成果はCNTネットワークの熱電変換特性向上の設計指針を示しただけでなく,原子振動の波動性を制御するための新しい手法を示したものであり,工業的・科学的の両面で興味深い成果である.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (10 results)

All 2022 2021 Other

All Int'l Joint Research (1 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Book (1 results) Remarks (1 results)

  • [Int'l Joint Research] Institute of High Performance Computing(シンガポール)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Anharmonic phonon renormalization and thermal transport in the type-I Ba8Ga16Sn30 clathrate from first principles2022

    • Author(s)
      M. Ohnishi, T. Tadano, S. Tsuneyuki, and J. Shiomi
    • Journal Title

      Phys. Rev. B

      Volume: 106 Issue: 2 Pages: 24303-24303

    • DOI

      10.1103/physrevb.106.024303

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Strain-induced band modulation of thermal phonons in carbon nanotubes2021

    • Author(s)
      Masato Ohnishi, Junichiro Shiomi
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 1 Pages: 014306-014306

    • DOI

      10.1103/physrevb.104.014306

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Electronic Transport Descriptors for the Rapid Screening of Thermoelectric Materials2021

    • Author(s)
      T. Deng, J. Recatala-Gomez, M. Ohnishi, D.V. Maheshwar Repaka, P. Kumar, A. Suwardi, A. Abutaha, I. Nandhakumar, K. Biswas, M. B. Sullivan, G. Wu, J. Shiomi, S-W. Yang, and K. Hippalgaonkar
    • Journal Title

      Materials Horizons

      Volume: 8 Issue: 9 Pages: 2463-2474

    • DOI

      10.1039/d1mh00751c

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Strain Engineering for Electronics and Thermal Management in Carbon Nanomaterials2022

    • Author(s)
      Masato Ohnishi
    • Organizer
      Youth Conference on Impurities and Defects in Semiconductors (YCIDS 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] クラスレート化合物の切り紙構造熱電デバイスへの応用2022

    • Author(s)
      大西正人,寺嶋真伍,山本貴博,藤村幸司,清水裕,山本潔,岩瀬英治,塩見淳一郎
    • Organizer
      第19回日本熱電学会学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] シリコン基クラスレート化合物の熱電解析と性能向上2022

    • Author(s)
      大西正人,山本貴博,藤村幸司,清水裕,山本潔,塩見淳一郎
    • Organizer
      第59回日本伝熱シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] Improvement of Thermoelectric Efficiency of Si-based Clathrate2021

    • Author(s)
      Masato Ohnishi, Koji Fujimura, Takahiro Yamamoto, Hiroshi Shimizu, Kiyoshi Yamamoto, and Junichiro Shiomi
    • Organizer
      2021 Virtual MRS Spring Meeting & Exhibit
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Book] 計算科学を活用した熱電変換材料の研究開発動向2022

    • Author(s)
      森孝雄,塩見淳一郎,他
    • Total Pages
      214
    • Publisher
      シーエムシー・リサーチ
    • Related Report
      2022 Annual Research Report
  • [Remarks] Masato Ohnishi's website

    • URL

      http://www.phonon.t.u-tokyo.ac.jp/people/~ohnishi/index.html

    • Related Report
      2022 Annual Research Report

URL: 

Published: 2020-04-28   Modified: 2024-01-30  

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