Development of n-type flexible thermoelectric material based on Mg2Si/CNT composite nanofibers

• Project/Area Number: 16K06790
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Tohoku University
• Principal Investigator: Kikuchi Keiko 東北大学, 工学研究科, 助教 (80361137)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 熱電変換材料 / カーボンナノチューブ

Outline of Final Research Achievements

Mg2Si/CNT thermoelectric nanofibers were successfully synthesized through the combined process of the colloidal process using silicon sub-micron powder and liquid-solid phase reaction. The synthesized Mg2Si coatings on CNTs showed less impurity and higher thermoelectric properties compared with those synthesized through our previous process. Moreover, thin-films made of Mg2Si/CNT composite nanofibers for use as a flexible thermoelectric material were successfully fabricated.

Academic Significance and Societal Importance of the Research Achievements

高効率の熱電変換デバイスを実現するためにはp型とn型，両方の熱電変換材料が必要であるが，高温でも安定なn型のフレキシブル熱電変換材料はこれまで存在しなかった．本研究で開発したナノファイバーは軽量で希少金属など資源量の制限を受けないMg2SiとCNTの組み合わせであり，薄膜化が比較的容易であることから，将来的な実用化が大いに期待される．さらに本研究で開発したコロイドプロセスを用いたCNT複合ナノファイバー合成法は，多くの無機熱電変換材料へ応用が可能であり，今後，高温使用可能なフレキシブル熱電変換素子の実現に向けてCNT複合ナノファイバーの開発促進に貢献するものである．

Research Products

• [Journal Article] Synthesis of n-type Mg2Si/CNT Thermoelectric Nanofibers (2017)
  • Author(s): Kikuchi Keiko、Yamamoto Kodai、Nomura Naoyuki、Kawasaki Akira
  • Journal Title: Nanoscale Research Letters Volume: 12 Issue: 1 Pages: 343-343
  • DOI: 10.1186/s11671-017-2120-y
  • Peer Reviewed / Open Access
• [Presentation] コロイドプロセスを用いたMg2Si/CNT複合ナノファイバーの合成と評価 (2018)
  • Author(s): 菊池圭子，野村直之，川崎亮
  • Organizer: 粉体粉末冶金協会平成30年度秋季大会
• [Presentation] Mg2Si/カーボンナノチューブ複合ナノファイバーの合成と形状制御 (2017)
  • Author(s): 菊池圭子，野村直之，川崎亮
  • Organizer: 粉体粉末冶金協会平成29年度春季大会
• [Presentation] K. Kikuchi, K. Yamamoto, N. Nomura, A. Kawasaki (2017)
  • Author(s): Synthesis of n-type Mg2Si-coated carbon nanotubes
  • Organizer: The 15th International Conference on Advanced Materials
  • Int'l Joint Research
• [Presentation] Synthesis of morphology controlled n-type Mg2Si/CNT thermoelectric nanofibers (2017)
  • Author(s): Keiko Kikuchi, Naoyuki Nomura, Akira Kawasaki
  • Organizer: JSPM International Conference on Powder and Powder Metallurgy
  • Int'l Joint Research
• [Presentation] Mg2Si/カーボンナノチューブ複合ナノファイバーの合成と熱電変換材料への応用 (2016)
  • Author(s): 菊池圭子, 野村直之, 川崎亮
  • Organizer: 粉体粉末冶金協会平成28年度秋季大会
  • Place of Presentation: 東北大学 (宮城県仙台市)
  • Year and Date: 2016-11-09
  • Invited
• [Presentation] Synthesis of n-type Mg2Si/CNT thermoelectric nanofibers (2016)
  • Author(s): Keiko Kikuchi, Naoyuki Nomura, Akira Kawasaki
  • Organizer: 9th Pacific Rim International Conference on Advanced Materials and Processing
  • Place of Presentation: Kyoto International Conference Center (Kyoto, Japan)
  • Year and Date: 2016-08-01
  • Int'l Joint Research
• [Presentation] Mg2Si/カーボンナノチューブ複合ナノファイバーの合成と熱電特性評価 (2016)
  • Author(s): 菊池圭子, 山本晃大, 野村直之, 川崎亮
  • Organizer: 粉体粉末冶金協会平成28年度春季大会
  • Place of Presentation: 京都工芸繊維大学 (京都府京都市)
  • Year and Date: 2016-05-24