• 文献标题:   On-Surface Synthesis of a Nitrogen-Doped Graphene Nanoribbon with Multiple Substitutional Sites
  • 文献类型:   Article
  • 作  者:   ZHANG Y, LU JC, LI Y, LI BJ, RUAN ZL, ZHANG H, HAO ZL, SUN SJ, XIONG W, GAO L, CHEN L, CAI JM
  • 作者关键词:   band gap engineering, nitrogen doped graphene nanoribbon, noncontact atomic force microscopy, onsurface synthesi, scanning tunneling microscopy
  • 出版物名称:   ANGEWANDTE CHEMIEINTERNATIONAL EDITION
  • ISSN:   1433-7851 EI 1521-3773
  • 通讯作者地址:  
  • 被引频次:   4
  • DOI:   10.1002/anie.202204736 EA MAY 2022
  • 出版年:   2022

▎ 摘  要

Doped graphene nanoribbons (GNRs) with heteroatoms are a principal strategy to fine-tune the electronic structures of GNRs for future device applications. Here, we successfully synthesized the N=9 nitrogen-doped armchair GNR on the Au(111) surface. Due to the flexibility of precursor molecules, three different covalent bonds (C-C, C-N, N-N) are formed in the GNR backbone. Scanning tunneling spectroscopy analysis together with band structure calculations reveals that the band gap of the N-9-AGNRs (C-C) will be enlarged compared to pristine 9-AGNRs, and the C-N bond and N-N bond at the isolated site of N-9-AGNR (C-C) will introduce new defect states near the Fermi level. DFT calculations reveal that the electronic structure of N-9-AGNR (C-C) shows semiconductor character, while N-9-AGNR (C-N) and N-9-AGNR (N-N) display metallic character. Our results provide a promising route for creating more complex molecular heterostructures with tunable band gaps, which may be useful for future molecular electronics and memory device applications.