2022 Fiscal Year Final Research Report
Multiscale Analysis of Thermoelectric Properties of Carbon Nanotubes
| Project/Area Number |
20K14661
|
|---|
| Research Category |
Grant-in-Aid for Early-Career Scientists
|
| Allocation Type | Multi-year Fund |
|---|
| Review Section |
Basic Section 19020:Thermal engineering-related
|
|---|
| Research Institution | The 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
|
| Keywords | カーボンナノチューブ / 熱電変換 / フォノン |
|---|
| 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.
|
| Free Research Field |
熱工学
|
| 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．
|
