title: Spatially resolved electronic structures of atomically precise armchair graphene nanoribbons.
abstract: Graphene has attracted much interest in both academia and industry. The challenge of making it semiconducting is crucial for applications in electronic devices. A promising approach is to reduce its physical size down to the nanometer scale. Here, we present the surface-assisted bottom-up fabrication of atomically precise armchair graphene nanoribbons (AGNRs) with predefined widths, namely 7-, 14- and 21-AGNRs, on Ag(111) as well as their spatially resolved width-dependent electronic structures. STM/STS measurements reveal their associated electron scattering patterns and the energy gaps over 1 eV. The mechanism to form such AGNRs is addressed based on the observed intermediate products. Our results provide new insights into the local properties of AGNRs, and have implications for the understanding of their electrical properties and potential applications.
authors.affiliation: Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542. physhh@csu.edu.cn
authors.forename: Han
authors.initials: H
authors.lastname: Huang
authors.forename: Dacheng
authors.initials: D
authors.lastname: Wei
authors.forename: Jiatao
authors.initials: J
authors.lastname: Sun
authors.forename: Swee Liang
authors.initials: SL
authors.lastname: Wong
authors.forename: Yuan Ping
authors.initials: YP
authors.lastname: Feng
authors.forename: A H Castro
authors.initials: AH
authors.lastname: Neto
authors.forename: Andrew Thye Shen
authors.initials: AT
authors.lastname: Wee
mesh_terms: D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D006108:Graphite / Q000737:chemistry*; D008422:Materials Testing; D054802:Molecular Imprinting / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D012666:Semiconductors; D013499:Surface Properties
chemical_list: D006108:Graphite