A Review on Investigation of Graphene Thermal Property: Recent Development in Measurement Techniques

Abstract

Early researches have actively attempted to measure the thermal conductivity since the thermal conductivity of graphene was predicted to be extremely higher than that of any other existing materials. At the beginning of graphene discovery, the characterization of thermal properties of graphene was extremely challenging work due to its atomic-layer thickness. In order to resolve problems regarding its sub-nanoscale thickness, many experimental techniques have been designed to demonstrate properties of graphene. Among various techniques, however, Raman-based techniques are regarded as highly effective tools for characterizing thermal properties of various types of graphene. In addition, techniques based on Raman spectroscopy can be similarly applied to unveil secrets of newly emerging two-dimensional materials like silicene, MoS2, h-BN. In this paper, we will review several representative experimental techniques for investigating thermal properties of graphene. In particular, Raman-based techniques will be introduced in detail. Furthermore, we will discuss on how each technique has been developed to supplement the shortcoming of the initial techniques.