• 文献标题:   Imaging local electronic corrugations and doped regions in graphene
  • 文献类型:   Article
  • 作  者:   SCHULTZ BJ, PATRIDGE CJ, LEE V, JAYE C, LYSAGHT PS, SMITH C, BARNETT J, FISCHER DA, PRENDERGAST D, BANERJEE S
  • 作者关键词:  
  • 出版物名称:   NATURE COMMUNICATIONS
  • ISSN:   2041-1723
  • 通讯作者地址:   Univ Calif Berkeley
  • 被引频次:   82
  • DOI:   10.1038/ncomms1376
  • 出版年:   2011

▎ 摘  要

Electronic structure heterogeneities are ubiquitous in two-dimensional graphene and profoundly impact the transport properties of this material. Here we show the mapping of discrete electronic domains within a single graphene sheet using scanning transmission X-ray microscopy in conjunction with ab initio density functional theory calculations. Scanning transmission X-ray microscopy imaging provides a wealth of detail regarding the extent to which the unoccupied levels of graphene are modified by corrugation, doping and adventitious impurities, as a result of synthesis and processing. Local electronic corrugations, visualized as distortions of the pi*cloud, have been imaged alongside inhomogeneously doped regions characterized by distinctive spectral signatures of altered unoccupied density of states. The combination of density functional theory calculations, scanning transmission X-ray microscopy imaging, and in situ near-edge X-ray absorption fine structure spectroscopy experiments also provide resolution of a longstanding debate in the literature regarding the spectral assignments of pre-edge and interlayer states.