• 文献标题:   Strain-activated edge reconstruction of graphene nanoribbons
  • 文献类型:   Article
  • 作  者:   CHENG YC, WANG HT, ZHU ZY, ZHU YH, HAN Y, ZHANG XX, SCHWINGENSCHLOGL U
  • 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:   King Abdullah Univ Sci Technol
  • 被引频次:   17
  • DOI:   10.1103/PhysRevB.85.073406
  • 出版年:   2012

▎ 摘  要

The edge structure and width of graphene nanoribbons (GNRs) are crucial factors for the electronic properties. A combination of experiment and first-principles calculations allows us to determine the mechanism of the hexagon-hexagon to pentagon-heptagon transformation. GNRs thinner than 2 nm have been fabricated by bombardment of graphene with high-energetic Au clusters. The edges of the GNRs are modified in situ by electron irradiation. Tensile strain along the edge decreases the transformation energy barrier. Antiferromagnetism and a direct band gap are found for a zigzag GNR, while a fully reconstructed GNR shows an indirect band gap. A GNR reconstructed on only one edge exhibits ferromagnetism. We propose that strain is an effective method to tune the edge and, therefore, the electronic structure of thin GNRs for graphene-based electronics.