時間領域サーモリフレクタンス法を用いた高配向グラファイトと金属薄膜の界面熱コンダクタンス計測

概要

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The thermal boundary conductance between the highly ordered pyrolytic graphite (HOPG) and aluminum, nickel and cobalt metal thin films has been measured at room temperature. The work aims to gain fundamental understanding into the thermal boundary conductance through the metal/graphite layer interface, which is essential for thermal management of graphene-based electric devices. The thermal conductance was measured using the time domain thermoreflectance (TDTR), a technique widely used to measure the thermal transport at the nanoscale. The measurements identify the dependence of the thermal boundary conductance on the metal kind. Furthermore, the trend was found to agree with that of the metal-graphene binding energy calculated by the density functional theory. The results suggest that the adhesion strength plays an important role in determining the thermal boundary conductance between metals and c-axis oriented HOPG.