thus presumably limiting the effect of capillary forces typical of humid environments. Singh et al. [8] demonstrated that the wetting angle is affected by the surface underneath the graphene layer; however, the effect of the substrate is modified by the number of layers and is negligible for multiple layers of graphene. Also, graphene is an atomically smooth two-dimensional material with low surface energy and is, therefore, able to replace the thin solid films usually used for reducing adhesion and friction of various surfaces.
All the properties mentioned above make graphene very attractive for demanding tribological applications to achieve low friction and low wear regimes.