• 文献标题:   Understanding controls on interfacial wetting at epitaxial graphene: Experiment and theory
  • 文献类型:   Article
  • 作  者:   ZHOU H, GANESH P, PRESSER V, WANDER MCF, FENTER P, KENT PRC, JIANG DE, CHIALVO AA, MCDONOUGH J, SHUFORD KL, GOGOTSI Y
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:   Argonne Natl Lab
  • 被引频次:   67
  • DOI:   10.1103/PhysRevB.85.035406
  • 出版年:   2012

▎ 摘  要

The interaction of interfacial water with graphitic carbon at the atomic scale is studied as a function of the hydrophobicity of epitaxial graphene. High resolution x-ray reflectivity shows that the graphene-water contact angle is controlled by the average graphene thickness, due to the fraction of the film surface expressed as the epitaxial buffer layer whose contact angle (contact angle theta(c) = 73 degrees) is substantially smaller than that of multilayer graphene (theta(c) = 93 degrees). Classical and ab initio molecular dynamics simulations show that the reduced contact angle of the buffer layer is due to both its epitaxy with the SiC substrate and the presence of interfacial defects. This insight clarifies the relationship between interfacial water structure and hydrophobicity, in general, and suggests new routes to control interface properties of epitaxial graphene.