Morphology dependence of the thermal transport properties of single-walled carbon nanotube thin films
Morphology dependence of the thermal transport properties of single-walled carbon nanotube thin films
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DOI：
10.1088/1361-6528/aa6698
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发表时间：
2017-05-05
期刊：
影响因子：
3.5
通讯作者：
Maruyama, S.
中科院分区：
文献类型：
--
作者：
Yoshida, S.;Feng, Y.;Maruyama, S.
利用拉曼光谱研究了无规网状单壁碳纳米管（SWNT）薄膜的热输运性质。两种类型的单壁碳纳米管薄膜进行了研究：单层和堆叠。单层膜通过气溶胶化学气相沉积和随后的直接干沉积来制造，而堆叠膜通过将单层膜放置在彼此之上来制备。这些膜中的每一个的网络结构的各向异性进行了评估的基础上的角度依赖性的光学吸收光谱。结果表明，在单层膜的情况下，随着膜厚的增加，膜的各向异性减小，并且在堆叠过程中保持膜的各向异性。在堆叠膜的情况下，片材热导率与单壁碳纳米管的面积密度成比例，但在单层膜的情况下，随着厚度的增加而减小。这种效果是由网络形态从二维各向异性结构到更各向同性结构的变化来解释的。这项工作表明，通过堆叠薄单壁碳纳米管薄膜的低密度薄膜的制造与高片热导率。
The thermal transport properties of random network, single-walled carbon nanotube (SWNT) films were assessed using Raman spectroscopy. Two types of SWNT films were investigated: single-layer and stacked. The single-layer films were fabricated by aerosol chemical vapour deposition and subsequent direct dry deposition, while the stacked films were prepared by placing the single-layer films on top of one another. The anisotropy of the network structures of each of these films was evaluated based on the angular dependence of the optical absorbance spectra. The results show that the anisotropy of the films decreases with increasing film thickness in the case of the single-layer films, and that the film anisotropy is preserved during the stacking process. The sheet thermal conductance is proportional to the SWNT area density in the case of stacked films, but is reduced with increasing thickness in the case of single-layer films. This effect is explained by a change in the network morphology from a two-dimensional anisotropic structure to the more isotropic structure. This work demonstrates the fabrication of low-density films with high sheet thermal conductance through the stacking of thin SWNT films.