Investigation on friction performance of graphene

Graphene is a newly emerging material in many different fields because of its special physical structure. This literature focuses on the influence of layer numbers on friction characteristics. The sample is deposited on a SiO₂ substrate. Optical microscope is used to precisely position the specimen while AFM and Raman spectroscopy are suitable tools to determine the layer number of the sheet material. It is found that both the friction force and friction coefficient are reduced with the increase of layer numbers. Moreover, it is also investigated that friction force increases with the velocity.