Functionalized graphene-oxide nanosheets with amino groups facilitate macroscale superlubricity

Abstract Graphene-oxide (GO) has been recognized as an excellent lubrication material owing to its two-dimensional structure and weak interlayer interactions. However, the functional groups of GO that can contribute anti-friction, anti-wear, superlubricity are yet be elucidated. Hence, further improvement in GO-family materials tribology fields is impeded. In this study, macroscale with a coefficient friction less than 0.01 achieved by exploiting high adhesive force between amino within aminated (GO-NH 2 ) nanosheets SiO . It was observed GO-NH form robust adsorption layer on worn surfaces groups. This not only protects contact contributes low wear, but also causes shearing plane transform constantly from solid asperities (high friction) into interlayers (weak interactions), resulting superlubricity. A -containing boundary formed tribochemical reactions liquid film conducive friction. Such provides insights effect functionalized basis for designing tribological performances.