• 文献标题:   Friction Reduction of Hydrogenated Graphene by Strain Engineering
  • 文献类型:   Article
  • 作  者:   PENG Y, LI JH, TANG XQ, LIU B, CHEN XZ, BAI LC
  • 作者关键词:   friction, hydrogenated graphene, biaxial strain, uniaxial strain, molecular dynamic
  • 出版物名称:   TRIBOLOGY LETTERS
  • ISSN:   1023-8883 EI 1573-2711
  • 通讯作者地址:   Cent South Univ
  • 被引频次:   0
  • DOI:   10.1007/s11249-019-1260-x
  • 出版年:   2020

▎ 摘  要

The pursuit of superlow friction in graphene systems has been a persistent target during the past decade. However, the friction is exhibited a remarkable increase for the chemically modified graphene with hydrogen element. To overcome this problem, both biaxial strain and uniaxial strains are applied on hydrogenated graphene to study the effect of strain on the interlayer friction between a rigid flake and a spring-supported hydrogenated graphene substrate by molecular dynamics simulations. Our simulation results indicate that with the increase of the hydrogenation coverage, the atomic-level roughness of hydrogenated graphene is found to increase, which eventually results in the increasing friction. During the stretching process, the atomic-level roughness of hydrogenated graphene is gradually reduced, which can be used to interpret the mechanism of the reduction of friction induced by strain. Such strain-induced reductions are robust over a wide range of commensurability, loads, and sizes. Moreover, it is demonstrated that the superlow friction also can be realized through the formation of incommensurate interface, the low rigidity of substrate, and the extended size of flake in sliding direction. These findings provide not only a fundamental understanding for the evolution of friction on hydrogenated graphene, but also an important insight for improving the tribological behaviors of nanodevices based on functionalized graphene.