Superlubricity of Graphite Sliding against Graphene Nanoflake under Ultrahigh Contact Pressure.

ABSTRACT: Superlubricity of graphite sliding against graphene can be easily attained at the nanoscale when it forms the incommensurate contact under a low contact pressure. However, the achievement of superlubricity under an ultrahigh contact pressure (>1 GPa), which has more applications in the lubrication of micromachine and nanomachine, remains unclear. Here, this problem is addressed and the robust superlubricity of graphite is obtained under ultrahigh contact pressures of up to 2.52 GPa, by the formation of transferred graphene nanoflakes on a silicon tip. The friction coefficient becomes as low as 0.0003, a state that is attributed to the extremely low shear strength of the graphene/graphite interface in the incommensurate contact. When the pressure exceeds some threshold, the superlubricity s

SUBMITTER: Li J 

PROVIDER: S-EPMC6247022 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature