Abstract
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 °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.
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