Fig. 7From: Study of Nanoscale Friction Behaviors of Graphene on Gold Substrates Using Molecular DynamicsThe friction force of the 5.8-nm square flake sliding on the (a) Au(001) and (b) Au(110) surfaces as a function of sliding distance at different normal loads. Here, a1 (= 4.08 Å) is the lattice spacing of Au(001) along the sliding direction and a2 (= 4.08 Å) is lattice spacing of Au(110) along the sliding directionBack to article page