论文标题
超对准的碳纳米管膜中可调的各向异性热传输
Tunable Anisotropic Thermal Transport in Super-Aligned Carbon Nanotube Films
论文作者
论文摘要
由于单个纳米管的各向异性性质和纳米管比对的重要作用，超对准的碳纳米管（CNT）膜具有有趣的各向异性热传输性能。然而，由于制备高质量的超级对准CNT膜样品以及如此高度各向异性和多孔薄膜的热表征，对齐对齐与各向异性热导电之间的关系尚未得到很好的了解。在这里，设计了具有不同对齐构型的超对准的CNT膜，并使用具有椭圆形梁方法的时域热水型（TDTR）测量其各向异性导电电导率。结果表明，对齐配置可以从6.4到1.5 w/mk调整跨平面导热率k_z，并且面内各向异性比率从1.2到13.5。这项工作证实了CNT对齐在调整超平等CNT膜的热传输特性中的重要作用，并提供了一种为热管理设计热各向异性膜的有效方法。
Super-aligned carbon nanotube (CNT) films have intriguing anisotropic thermal transport properties due to the anisotropic nature of individual nanotubes and the important role of nanotube alignment. However, the relationship between the alignment and the anisotropic thermal conductivities was not well understood due to the challenges in both the preparation of high-quality super-aligned CNT film samples and the thermal characterization of such highly anisotropic and porous thin films. Here, super-aligned CNT films with different alignment configurations are designed and their anisotropic thermal conductivities are measured using time-domain thermoreflectance (TDTR) with an elliptical-beam approach. The results suggest that the alignment configuration could tune the cross-plane thermal conductivity k_z from 6.4 to 1.5 W/mK and the in-plane anisotropic ratio from 1.2 to 13.5. This work confirms the important role of CNT alignment in tuning the thermal transport properties of super-aligned CNT films and provides an efficient way to design thermally anisotropic films for thermal management.
