Fig. 4
From: Study of Nanoscale Friction Behaviors of Graphene on Gold Substrates Using Molecular Dynamics
The variation of friction force and average friction force for different flake shapes. The typical friction force as a function of sliding distance for the round (N = 1080 atoms) flake (a) and triangular (N = 654 atoms) flake (b). c The average friction force per atom (Ffric/N) as a function of load per atom (L/N). Here, a0 (= 9.99 Å) is the lattice spacing of Au(111) along the sliding direction