Friction behavior of 2D hydrogenated diamond-like films and bilayer graphene

It is important to distinguish the friction behavior between 2D hydrogenated diamond-like film (HDLF) and bilayer graphene (BG), which makes it difficult to determine the friction mechanisms due to the complexity of the sliding interface. Nano-scratch simulation is carried out to investigate the change of the average friction force and the degree of friction of the epitaxial 2D carbon film covering the surface of 4H-SiC under different normal loads. The results show that along with the increase of normal load, the average friction force on the interface of HDLF increases sharply compared with that in BG. During the stick-slip process, the huge damping produced by HDLF differs from the friction behavior of BG films due to the fast transport of phonons at the interface. [Display omitted] •We explore the distinctions in friction behavior between bilayer graphene (BG) and hydrogenated diamond-like films (HDLF).•As the normal load increases, the average friction of HDLF increases sharply, while that of BG increases relatively slowly.•The huge friction damping of HDLF may be caused by the conduction effect of the sp3 bond.•The average friction between HDLF and BG fluctuates non-monotonously with increasing temperature.