超取向碳纳米管薄膜的可调各向异性热输运
Tunable Anisotropic Thermal Transport in Super-Aligned Carbon Nanotube Films
摘要：
超取向碳纳米管薄膜由于其自身的各向异性和取向的重要作用而具有独特的各向异性热输运特性。然而，由于在制备高质量的超取向CNT膜样品和这种高度各向异性和多孔薄膜的热表征方面的挑战，取向和各向异性热导率之间的关系还没有得到很好的理解。在这里，超对准的碳纳米管薄膜具有不同的取向配置的设计和测量其各向异性的热导率使用时域热反射（TDTR）与椭圆束的方法。结果表明，该取向结构可以将薄膜的跨面热导率kz从6.4调整到1.5 W/mK，面内各向异性比从1.2调整到13.5。这项工作证实了碳纳米管对齐的重要作用，在调整超对齐的碳纳米管薄膜的热传输性能，并提供了一种有效的方法来设计热各向异性薄膜的热管理。
英文摘要：
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.
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