二维材料各向异性导热系数和边界热导率的同时测量
Simultaneous measurement of anisotropic thermal conductivity and thermal boundary conductance of 2-dimensional materials
摘要：
已经分离或合成的二维（2D）材料的数量迅速增加，为实现新的器件功能提供了巨大的机会。虽然它们的光学和电学特性已经更容易报道，但由于局部热流的困难，定量热特性更具挑战性。已经建立的用于研究块体材料或薄膜的光学泵浦-探测技术对面内热传输的灵敏度有限，因此在2D材料中常见的热各向异性的表征具有挑战性。在这里，我们提出了一种新的方法来量化的热性能的基础上的磁光克尔效应，产生定量的洞察到跨平面和平面内的热输运。使用非常薄的磁性材料作为加热器/温度计增加了平面内的热梯度，而不使数据分析复杂化，尽管该层是光学半透明的。该方法具有额外的好处，即它不需要将样品悬浮，从而提供了在支持的类似设备的环境中的热传输的洞察力。我们应用这种方法来测量一系列二维材料的热性能，这些材料对器件应用感兴趣，包括单层石墨烯，少层h-BN，单层和少层MoS 2和块状MoSe 2晶体。所测量的热特性将对器件应用中的热管理具有重要意义。
英文摘要：
The rapidly increasing number of 2-dimensional (2D) materials that have been isolated or synthesized provides an enormous opportunity to realize new device functionalities. Whereas their optical and electrical characterization have been more readily reported, quantitative thermal characterization is more challenging due to the difficulties with localizing heat flow. Optical pump-probe techniques that are well-established for the study of bulk materials or thin-films have limited sensitivity to in-plane heat transport, and the characterization of the thermal anisotropy that is common in 2D materials is therefore challenging. Here we present a new approach to quantify the thermal properties based on the magneto-optical Kerr effect that yields quantitative insight into cross-plane and in-plane heat transport. The use of a very thin magnetic material as heater/thermometer increases in-plane thermal gradients without complicating the data analysis in spite of the layer being optically semi-transparent. The approach has the added benefit that it does not require the sample to be suspended, providing insight of thermal transport in supported, device-like environments. We apply this approach to measure the thermal properties of a range of 2D materials which are of interest for device applications, including single layer graphene, few-layer h-BN, single and few layer MoS2, and bulk MoSe2 crystal. The measured thermal properties will have important implications for thermal management in device applications.
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