Fig. 2From: Study of Nanoscale Friction Behaviors of Graphene on Gold Substrates Using Molecular DynamicsFriction force as a function of sliding distance at various normal loads (L). The flake has a square shape with a size of 5.8 nm. Here, a0 (= 9.99 Å) is the lattice spacing of Au(111) along the sliding directionBack to article page