• 文献标题:   Robust ultra-low-friction state of graphene via moire superlattice confinement
  • 文献类型:   Article
  • 作  者:   ZHENG XH, GAO L, YAO QZ, LI QY, ZHANG M, XIE XM, QIAO S, WANG G, MA TB, DI ZF, LUO JB, WANG X
  • 作者关键词:  
  • 出版物名称:   NATURE COMMUNICATIONS
  • ISSN:   2041-1723
  • 通讯作者地址:   Chinese Acad Sci
  • 被引频次:   39
  • DOI:   10.1038/ncomms13204
  • 出版年:   2016

▎ 摘  要

Two-dimensional (2D) materials possess outstanding lubrication property with their thicknesses down to a few atomic layers, but they are easily susceptible to sliding induced degradation or ubiquitous chemical modification. Maintaining the superior lubricating performance of 2D materials in a harsh working environment is highly desirable yet grandly challenging. Here we show that by proper alignment of graphene on a Ge(111) substrate, friction of graphene could be well preserved at an ultra-low level even after fluorination or oxidation. This behaviour is experimentally found to be closely related to the suppression of molecular-level deformation of graphene within the moire superlattice structure. Atomistic simulations reveal that the formation of an interconnected meshwork with enhanced interfacial charge density imposes a strong anchoring effect on graphene even under chemical modification. Modulating molecular-level deformation by interfacial confinements may offer a unique strategy for tuning the mechanical or even chemical properties of 2D materials.