▎ 摘　　要

Eight kinds of GOs with different oxidation degree were synthesized. Molecular structure characterization indicated that with more usage of H2SO4, less usage of KMnO4, and more reaction time at high temperatures (95 degrees C), the oxidation degree of GO decreased. Tribological tests showed that GO water suspensions could reduce the friction coefficient of water by 33-46% as well as decrease the wear rate of water by 36-64%. Lubrication mechanism verified the formation of GO tribofilms on the sliding surface. GO with higher oxidation degree had a better adsorption capacity and the optimum concentration was 0.15mg/ml. Moreover, some oxygen-containing groups of GO were decomposed to form a graphene-like structure, which would increase the tribological property of GO suspensions.