• 文献标题:   Graphene with the secondary amine-terminated zigzag edge as a line electron emitter
  • 文献类型:   Article
  • 作  者:   WANG WL, LI ZB
  • 作者关键词:  
  • 出版物名称:   APPLIED PHYSICS AMATERIALS SCIENCE PROCESSING
  • ISSN:   0947-8396
  • 通讯作者地址:   Sun Yat Sen Univ
  • 被引频次:   6
  • DOI:   10.1007/s00339-012-7180-3
  • 出版年:   2012

▎ 摘  要

An extraordinary low vacuum barrier height of 2.30 eV has been found on the zigzag-edge of graphene terminated with the secondary amine via the ab initio calculation. This edge structure has a flat band of edge states attached to the gamma point where the transversal kinetic energy is vanishing. We show that the field electron emission is dominated by the flat band. The edge states pin the Fermi level to a constant, leading to an extremely narrow emission energy width. The graphene with such edge is a promising line field electron emitter that can produce a highly coherent emission current.