▎ 摘　　要

Heat transfer in the electronics industry has become a critical problem for the progress of miniaturizing device components. As a filler for thermal interface materials (TIMs), graphene has attracted great attention owing to high thermal conductivity and low Kapitza resistance. Therefore, how to obtain high quality and large-scale graphene has become a key issue. In this report, we suggest an approach, which is simple, fast, efficient and eco-friendly, to reduce graphene oxide by sub/supercritical water from 200 to 400 degrees C. The reduction of graphene oxide is caused by higher temperature and the unique characteristic of water in this temperature range. This hypothesis is verified by X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman, thermal gravimetric analysis (TGA) results and comparison experiments. Furthermore, we used the reduced graphene oxide as a filler for graphene-epoxy composites. As a result, the thermal conductivity of the composites significantly increased compared to the pristine epoxy. (C) 2015 Published by Elsevier Ltd.