| 研究課題/領域番号 |
20H02090
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| 研究機関 | 九州大学 |
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研究代表者 |
李 秦宜 九州大学, 工学研究院, 准教授 (60792041)
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| 研究分担者 |
高橋 厚史 九州大学, 工学研究院, 教授 (10243924)
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| 研究期間 (年度) |
2020-04-01 – 2023-03-31
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| キーワード | Nanoscale heat transfer / Thermal conductivity |
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| 研究実績の概要 |
In FY2021, we have first established an experimental method that allows concurrently the in-situ thermal conductivity measurement and the real-time internal structure observation of a single one-dimensional (1D) material using scanning transmission electron microscopy in a scanning electron microscope (STEM-in-SEM). Using this method, we in-situ measured the thermal conductivities of individual cup-stacked carbon nanotubes and concurrently observed the internal hollow structures. We found that the sample with more structural disorders had a lower thermal conductivity. Our measurement method can pave the way to the sample by-sample elucidation of the structure-property relationship for 1D materials. This achievement has been published in Appl. Phys. Lett. Second, we have established the method to tune the thermoelectric properties of monolayer graphene by introducing gate voltage. Third, we have tested how to introduce nanoscale defects in graphene with a nano-probe and measured the temperature distribution with scanning thermal microscopy (SThM) at the same time. We have analyzed the heat transfer mechanisms and errors related with the contact SThM thermometry. Fourth, we have prepared nanoscale samples for lock-in Raman measurements. Besides, we have developed a method to measure nanoscale flow characteristics in graphene nanochannels.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
This project aims to develop a platform for nanoscale thermophysical property measurement and elucidate nanoscale heat transfer mechanisms. In FY2021, in addition to the establishment of the Raman-based platform, we have set up the platform based on electron microscopy and scanning thermal microscopy. We also elucidated the relationship between the internal nanostructure and the thermal conductivity of individual 1D materials.
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| 今後の研究の推進方策 |
In FY2022, we will first apply the lock-in Raman technique in the thermal conductivity mapping of individual low-dimensional materials. Second, we will optimize the platform based on electron microscopy and use this platform to study a variety of nanoscale heat conduction phenomena.
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