Nanoscratching of multi-layer graphene by molecular dynamics simulationsViews [2236] Delivery time :2015-03-03 11:49:35

                             Nanoscratching of multi-layer graphene by molecular dynamics simulations

Qi Zhang^1,2, Dongfeng Diao1*and Momoji Kubo³

TribologyInternational 88(2015)85–88 (PDF-File)

1) Institute of Nanosurface Science and Engineering, Shenzhen University, Shenzhen 518060, China
2) Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of
Mechanical Engineering, Xi’an Jiaotong University, Xi'an 710049, China
3) Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University,
Sendai 980-8579, Japan

Abstract

         Graphene or graphene-based materials are becoming a glowing material to be expected to control a frictional behaviorat contact interface. However, due to its atomic layer to layer structure, it is difficult to clarify its frictional mechanism through experimental observation. Therefore, in this paper the frictional behavior of diamond tip nanoscratching on multi-layer graphene was investigated by Molecular Dynamics (MD) simulation. Results show superlow frictional behavior of graphene layers when the scratch depth is less than 5.3 Å, when the scratch depth is over this value, the friction coefficient increases at least 10 times which is caused by phase transition of graphene layers. Besides, we discussed the sensitivity of friction coefficient to the shapes of scratch tip and its anisotropy.