• 文献标题:   Mapping electronic states of triple anti-parallel and symmetric zigzag grain boundaries of graphene on highly oriented pyrolytic graphite
  • 文献类型:   Article
  • 作  者:   MA J, LI XY, YIN LJ, WANG WX, SUN Q, YANG Y, ZHANG P, NIE JC, XIONG CM, DOU RF
  • 作者关键词:   periodic grain boundaries gbs, electronic state, graphene, scanning tunneling microscopy/spectroscopy stm/s, high oriented pyrolytic graphite hopg
  • 出版物名称:   CHEMICAL PHYSICS LETTERS
  • ISSN:   0009-2614 EI 1873-4448
  • 通讯作者地址:   Beijing Normal Univ
  • 被引频次:   0
  • DOI:   10.1016/j.cplett.2017.12.020
  • 出版年:   2018

▎ 摘  要

We studied the structures and electronic spectra of two periodic GBs in graphene on highly oriented pyrolytic graphite (HOPG) surface by using scanning tunneling microscopy and spectroscopy (STM/S). It was found that a GB consisting of triple anti-parallel dislocation arrays of pentagonal-heptagonal (5-7) carbon rings induced an enhanced localized state above the Dirac point, which was attributed to van Hove singularities (VHSs). The localized state was site dependent with the variation between 0.47 and 0.36 eV. Another periodic GB with a symmetric zigzag structure presented VHSs at -0.038 and 0.12 eV near the Fermi level. Moreover, intervalley scattering was observed on GBs. This finding further suggested that defect engineering might tune the electronic structures of graphene and even the performance of graphene-based electronic devices by properly mediating and designing ordered GBs in a graphene layer. (C) 2017 Elsevier B.V. All rights reserved.