Roles of sliding-induced defects and dissociated water molecules on low friction of graphene.

ABSTRACT: Sliding contact experiments and first-principles calculations were performed to elucidate the roles of structural defects and water dissociative adsorption process on the tribo-chemical mechanisms responsible for low friction of graphene. Sliding friction tests conducted in ambient air and under a dry N₂ atmosphere showed that in both cases a high running-in coefficient of friction (COF) occurred initially but a low steady-state COF was reached only when the sliding was continued in air with moisture. Density functional theory (DFT) calculations indicated that the energy barrier (E _b ) for dissociative adsorption of H₂O was significantly lower in case of reconstructed graphene with a monovacancy compared to pristine graphene. Cross-sectional transmission el

SUBMITTER: Yang Z 

PROVIDER: S-EPMC5760666 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature