title: Graphene-like single-layered covalent organic frameworks: synthesis strategies and application prospects.
abstract: Two-dimensional (2D) nanomaterials, such as graphene and transition metal chalcogenides, show many interesting dimension-related materials properties. Inspired by the development of 2D inorganic nanomaterials, single-layered covalent organic frameworks (sCOFs), featuring atom-thick sheets and crystalline extended organic structures with covalently bonded building blocks, have attracted great attention in recent years. With their unique graphene-like topological structure and the merit of structural diversity, sCOFs promise to possess novel and designable properties. However, the synthesis of sCOFs with well-defined structures remains a great challenge. Herein, the recent development of the bottom-up synthesis methods of 2D sCOFs, such as thermodynamic equilibrium control methods, growth-kinetics control methods, and surface-assisted covalent polymerization methods, are reviewed. Finally, some of the critical properties and application prospects of these materials are outlined.
authors.affiliation: Key Laboratory of Molecular Nanostructure and Nanotechnology and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, P. R. China; University of CAS, Beijing, 100049, P. R. China.
authors.forename: Xuan-He
authors.initials: XH
authors.lastname: Liu
authors.forename: Cui-Zhong
authors.initials: CZ
authors.lastname: Guan
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Wan
keywords: bottom-up approach; single-layered covalent organic frameworks; synthesis strategies; two-dimensional nanomaterials