Interface Friction between Neighbor Diamondene Nanoribbons: A Molecular Dynamics Study

Abstract

Diamondene, a typical two-dimensional carbon material, can be formed by compressing two or more layers of graphene at ultrahigh pressure. The nanofriction of diamondene ribbon (DR) is evaluated in this study. Unlike graphene, which has only sp2 atoms, half of the surface carbon atoms on a diamondene change to be sp3 atoms after compression. In addition, each of the remained atoms connects three neighbor sp3 atoms. Due to its unique carbon-carbon (C-C) bond topology, diamondene exhibits different frictional properties compared to pristine graphene. For a given sample of DR at a specific temperature, it has a maximum static friction force that is significantly greater than that of a graphene sample with the same size. This demonstrates the higher shear strength between DRs. The shear strength of DRs is an intrinsic property and measures approximately 0.0224 meV/Å3 at 10 K. When the pulling force on the sample exceeds the maximum static friction force, the sample undergoes a period of acceleration before reaching a stable sliding velocity. The viscous damping coefficient increases with the pulling force while decreases with increasing temperature. These properties make DRs suitable for potential applications in dynamic nanodevices.

Keywords: Diamondene, Surface friction, Viscous damping coefficient, molecular dynamics