A. V. Khomenko, N. V. Prodanov, B. N. J. Persson
We present classical molecular dynamics calculations of the behavior of copper and gold nanoparticles on a graphene sheet, sheared with constant applied force $F_{\rm a}$. The force $F_{\rm s}$ acting on the particle from the substrate depends on the material of the nanoparticles (Au or Cu), and exhibits a sawtooth dependency on time, which we attribute to local commensurability between the metal nanoparticle surface atomic positions with the graphene lattice. The time-averaged value of $F_{\rm s}$ (the friction force) acting on Au nanoparticles increases linearly with contact area, with slopes close to the experimentally observable ones. A qualitative model is proposed to explain the observed results.
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http://arxiv.org/abs/1302.6432
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