4.7 Article

Friction evolution with transition from commensurate to incommensurate contacts between graphene layers

期刊

TRIBOLOGY INTERNATIONAL
卷 136, 期 -, 页码 259-266

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2019.03.058

关键词

Friction evolution; Ultra-low friction; Moire patterns; Graphene layers

资金

  1. National Natural Science Foundation of China [51665030, 51435003, 51575104]
  2. Natural Science Foundation of Gansu Province, China [17JR5RA114]
  3. National Foundation of China Scholarship Council [201708625074]
  4. Scientific Research Foundation of Graduate School of Southeast University [YBJJ1749]

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By performing molecular dynamics simulations, the interfacial atomic forces of two contacting graphene flakes are calculated to quantitatively illustrate the friction evolution from commensurate to incommensurate contacts. It is found that the atomic force distributions display moire patterns. The moire patterns for the contact stress indicate the contact quality, while the patterns for the shear stress are related to the friction force. In both the commensurate and incommensurate contacts, part of the interface atoms experiences positive friction force while the other atoms negative friction force. However, the interfacial friction distributions for the incommensurate state clearly demonstrate that the positive and negative atomic friction forces distribute more symmetry than that in the commensurate state, which produces an ultra-low effective friction force.

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