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Title: Atomic-scale friction modulated by potential corrugation in multi-layered graphene materials

Friction is an important issue that has to be carefully treated for the fabrication of graphene-based nano-scale devices. So far, the friction mechanism of graphene materials on the atomic scale has not yet been clearly presented. Here, first-principles calculations were employed to unveil the friction behaviors and their atomic-scale mechanism. We found that potential corrugations on sliding surfaces dominate the friction force and the friction anisotropy of graphene materials. Higher friction forces correspond to larger corrugations of potential energy, which are tuned by the number of graphene layers. The friction anisotropy is determined by the regular distributions of potential energy. The sliding along a fold-line path (hollow-atop-hollow) has a relatively small potential energy barrier. Thus, the linear sliding observed in macroscopic friction experiments may probably be attributed to the fold-line sliding mode on the atomic scale. These findings can also be extended to other layer-structure materials, such as molybdenum disulfide (MoS{sub 2}) and graphene-like BN sheets.
Authors:
 [1] ;  [2]
  1. Beijing Key Laboratory of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124 (China)
  2. Institute of Earthquake Science, China Earthquake Administration, Beijing 10036 (China)
Publication Date:
OSTI Identifier:
22399309
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANISOTROPY; BORON NITRIDES; FABRICATION; FRICTION; GRAPHENE; LAYERS; MOLYBDENUM SULFIDES; NANOSTRUCTURES; POTENTIAL ENERGY; POTENTIALS; SHEETS; SURFACES