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To determine the friction coefficient of graphene, micro-scale scratch testsare conducted on exfoliated and epitaxial graphene at ambient conditions. Theexperimental results show that the monolayer, bilayer, and trilayer grapheneall yield friction coefficients of approximately 0.03. The friction coefficientof pristine graphene is less than that of disordered graphene, which is treatedby oxygen plasma. Ramping force scratch tests are performed on graphene withvarious numbers of layers to determine the normal load required for the probeto penetrate graphene. A very low friction coefficient and also its highpressure resistance make graphene a promising material for antiwear coatings.

Frictional characteristics of exfoliated and epitaxial graphene