We experimentally demonstrate that graphene and graphene fluoride manifest different coefficients of sliding friction at the edges (graphene fluoride from 5.8×10-3 to 4.9×10-1; graphene from 8.2×10-3 to 3.3×10-1) of a sheet sample versus the interior (graphene fluoride from 5.1×10-3 to 1.5×10-1; graphene from 2.5×10-2 to 2.3×10-1) under ambient humidity conditions (~ 40-60%). Atomic force microscopy (AFM) was used to prove the friction coefficients show distinct directional dependence between graphene and graphene fluoride.
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