▎ 摘　　要

The challenges of graphene as a high-performance additive applied in lubricant are its dispersibility and transparency. Herein, oleic diethanolamide borate (ODAB)-grafted graphene oxide nanosheets (GO) with good dispersibility in oil were successfully achieved. The structure analysis of the as-prepared ODAB-grafted GO (MGO) nanosheets verified that the molecular ODAB has bonded with the active groups of the GO nanosheets surface, as determined by characterizations. In addition, the tribological properties of the MGO nanosheets as lubricant additive applied in oil were evaluated by a friction-testing machine, and the morphologies of worn surfaces were observed by 3D laser scanning microscope. The results showed that the MGO nanosheets possessed excellent dispersibility and transparency in oil, while the friction coefficient and wear scar diameter (WSD) of the MGO-based oil with 0.02 wt % MGO content decreased to about 38.4% and 42.0% less than those of the base oil, respectively.