One-directional thermal transport in densely aligned single-wall carbon nanotube films
One-directional thermal transport in densely aligned single-wall carbon nanotube films
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DOI：
10.1063/1.5127209
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发表时间：
2019-11
影响因子：
4
通讯作者：
Shingi Yamaguchi;Issei Tsunekawa;Natsumi Komatsu;Weilu Gao;T. Shiga;T. Kodama;J. Kono;J. Shiomi
中科院分区：
文献类型：
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作者：
Shingi Yamaguchi;Issei Tsunekawa;Natsumi Komatsu;Weilu Gao;T. Shiga;T. Kodama;J. Kono;J. Shiomi
单个碳纳米管（CNTs）具有极高的导热性。然而，到目前为止，碳纳米管宏观组装体的热导率及其各向异性仍然很小。在这里，我们报告了通过控制真空过滤制备的几乎完全对齐的碳纳米管薄膜的定向热传输测量结果。我们发现热导率为43 +- 2.2 W m^-1 K^-1，热各向异性为500，创历史新高。根据热导率的温度依赖性及其与原子声子输运计算的一致性，我们得出结论，由于CNTs之间的大接触面积，管间热阻对对准方向热传导的影响可以忽略不计。因此，这些观察结果代表了理想的单向热传递，即薄膜的导热性仅由单个碳纳米管的导热性决定。
Individual carbon nanotubes (CNTs) possess extremely high thermal conductivities. However, the thermal conductivities and their anisotropy of macroscopic assemblies of CNTs have so far remained small. Here, we report results of directional thermal transport measurements on a nearly-perfectly aligned CNT film fabricated via controlled vacuum filtration. We found the thermal conductivity to be 43 +- 2.2 W m^-1 K^-1 with a record-high thermal anisotropy of 500. From the temperature dependence of the thermal conductivity and its agreement with the atomistic phonon transport calculation, we conclude that the effect of intertube thermal resistance on heat conduction in the alignment direction is negligible because of the large contact area between CNTs. These observations thus represent ideal unidirectional thermal transport, i.e., the thermal conductivity of the film is determined solely by that of individual CNTs.