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Figure 4 | Nanoscale Research Letters

Figure 4

From: Kinetic nanofriction: a mechanism transition from quasi-continuous to ballistic-like Brownian regime

Figure 4

The effect of rotational degrees of freedom of C 60 on the potential energy surface (PES). (a-e) Various configurations are used to examine the PES profiles. These configurations are named as: (a) Hex.-In Phase; (b) Hex.-Out Phase; (c) Pentagon; (d) Line-In Phase; and (e) Line-Out Phase. (f) Three-dimensional PES for the Hex.-In Phase configuration. (g) Contour plot representation of the PES in (f). The white arrow in (g) indicates the diffusion path with the lowest energy barrier. The arrangement of graphene atoms and their bonds is also illustrated in this figure. (h) and (i) show the PES profiles for the C60 with different facets, as shown in (a-e), during its translation along the [100] and [120] crystallographic directions of graphene, respectively.

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