基于多尺寸微球探针石墨烯表面超低摩擦研究

微纳器件因尺寸缩小带来极高的比表面积，尺度效应引起的表面黏附和摩擦等凸显. 本文中基于原子力显微镜(AFM)借助不同尺寸的微球探针，探究尺度效应对石墨烯表面的黏附力及摩擦力的影响. 试验结果表明：当针尖-样品接触副材料相同时，黏附力和摩擦力均随着针尖尺寸的增大而增大；黏附力和摩擦力的增大有助于石墨烯转移到针尖表面，当针尖表面黏有石墨烯后，石墨烯/石墨烯接触副使得黏附力、摩擦力及摩擦系数远远低于正常水平，摩擦系数低至0.001级别，实现超低摩擦.

As the dimensions of micro-nano devices shrink, they possess an extremely high specific surface area, and surface adhesion, friction and other phenomena induced by scale effects become increasingly prominent. In this study, we investigate the influence of scale effects on the adhesion force and friction force on graphene surfaces using atomic force microscopy (AFM) equipped with microsphere probes of varying sizes. The experimental results demonstrate that when the tip-sample contact pair materials are identical, both the adhesion force and friction force increase with the enlargement of the tip size. The increased adhesion force and friction force facilitate the transfer of graphene onto the tip surface. Once graphene adheres to the tip surface, the graphene/graphene contact pair leads to significantly lower adhesion force, friction force and friction coefficient compared to normal levels, with the friction coefficient dropping to the 0.001 order of magnitude, achieving ultra-low friction.