Abstract: In order to further investigate the frictional force characteristics of the silicon probing at the edge of graphene and its microscopic friction mechanism, a model was established by using molecular dynamics method, focusing on the variation of frictional force under different levels and positive pressure. The friction characteristics were also analyzed by using the strain cloud in the x and z directions. The results show that the positive pressure has little effect on the frictional characteristics of the graded edge of graphene, but the change of the number of steps will have a great influence on the frictional characteristics. In the process of pressing on the step, the phenomenon of compressive stress accumulation is accompanied by the release of compressive stress in the process of multi-step climbing. The compressive strain in the x direction and the integrity of the center of the crater in the z direction are important indexes to measure the friction force.

Key words: graphene, step edge, lateral force, friction, molecular dynamics