title: Surface-confined single-layer covalent organic framework on single-layer graphene grown on copper foil.
abstract: The integration of 2D covalent organic frameworks (COFs) with atomic thickness with graphene will lead to intriguing two-dimensional materials. A surface-confined covalently bonded Schiff base network was prepared on single-layer graphene grown on copper foil and the dynamic reaction process was investigated with scanning tunneling microscopy. DFT simulations provide an understanding of the electronic structures and the interactions between the surface COF and graphene. Strong coupling between the surface COF and graphene was confirmed by the dispersive bands of the surface COF after interaction with graphene, and also by the experimental observation of tunneling condition dependent contrast of the surface COF.
authors.affiliation: Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, Harbin Institute of Technology, Harbin, 150080 (P.R. China).
authors.forename: Lirong
authors.initials: L
authors.lastname: Xu
authors.forename: Xin
authors.initials: X
authors.lastname: Zhou
authors.forename: Wei Quan
authors.initials: WQ
authors.lastname: Tian
authors.forename: Teng
authors.initials: T
authors.lastname: Gao
authors.forename: Yan Feng
authors.initials: YF
authors.lastname: Zhang
authors.forename: Shengbin
authors.initials: S
authors.lastname: Lei
authors.forename: Zhong Fan
authors.initials: ZF
authors.lastname: Liu
keywords: STM; Schiff base; density functional calculations; graphene; surface covalent organic framework