Construction of Diamond/Graphene Composite Structure via a Low-Temperature Heat Treatment

A diamond/graphene composite structure can be obtained using graphene oxide (GO) to undergo a significant thermal reduction reaction at approximately 200°C. The prepared composites were characterized via X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The effects of different particle sizes and diamond contents on the products’ phase composition and microstructure were studied. Results indicate that GO underwent a significant thermal reduction reaction at approximately 200°C. Most GO materials were reduced to graphene. They underwent expansion and were peeled off into an organ-like shape. A graphene coating was formed on the surface of diamond particles via a simple heat treatment from the mixtures of diamond and GO powders. The coating effect of large diamond particles was poor because of their high inertness. A quasi core–shell structure of diamond/graphene composite structure can be obtained using fine-grained diamonds.