Design of Friction-Controllable Fullerene Molecular Bearing Systems

采用分子力学模拟方法研究了C60/石墨烯和石墨烯/石墨烯界面的超润滑性。首先，对于（graphene）n/C_（60）/（graphene）n界面的超润滑性，发现多层（n>1）和单层（n=1）体系的超润滑性不同，对于单层体系，超润滑性仅来源于C_（60）和石墨烯之间的堆积关系。其次，理论和实验发现，对于石墨烯片的剥离和粘附，由于表面接触区的粘滑运动，得到了准周期的侧向力曲线，其周期与石墨的晶格常数几乎一致。

Superlubricity of C60/graphene and graphene/graphene interfaces is studied by molecular mechanics simulation. First, for superlubricity of (graphene)n/C60/(graphene)n interface, difference between multilayer (n>1) and monolayer (n=1) systems are found. For monolayer, superlubricity is derived from only stacking relation between C60 and graphene. However, for multilayer, superlubricity is also derived from that between graphene and graphene, which opens an lower energy path. Next, it is found by theory and experiment that, for peeling and adhesion of graphene sheet, quasiperiodic lateral force curve is obtained due to stick-slip motion during surface contact region, whose period nearly corresponds to the lattice constant of graphite.