title: Oriented 2D covalent organic framework thin films on single-layer graphene.
abstract: Covalent organic frameworks (COFs), in which molecular building blocks form robust microporous networks, are usually synthesized as insoluble and unprocessable powders. We have grown two-dimensional (2D) COF films on single-layer graphene (SLG) under operationally simple solvothermal conditions. The layered films stack normal to the SLG surface and show improved crystallinity compared with COF powders. We used SLG surfaces supported on copper, silicon carbide, and transparent fused silica (SiO(2)) substrates, enabling optical spectroscopy of COFs in transmission mode. Three chemically distinct COF films grown on SLG exhibit similar vertical alignment and long-range order, and two of these are of interest for organic electronic devices for which thin-film formation is a prerequisite for characterizing their optoelectronic properties.
authors.affiliation: Department of Chemistry and Chemical Biology, Cornell University, Baker Laboratory, Ithaca, NY 14853, USA.
authors.forename: John W
authors.initials: JW
authors.lastname: Colson
authors.forename: Arthur R
authors.initials: AR
authors.lastname: Woll
authors.forename: Arnab
authors.initials: A
authors.lastname: Mukherjee
authors.forename: Mark P
authors.initials: MP
authors.lastname: Levendorf
authors.forename: Eric L
authors.initials: EL
authors.lastname: Spitler
authors.forename: Virgil B
authors.initials: VB
authors.lastname: Shields
authors.forename: Michael G
authors.initials: MG
authors.lastname: Spencer
authors.forename: Jiwoong
authors.initials: J
authors.lastname: Park
authors.forename: William R
authors.initials: WR
authors.lastname: Dichtel
mesh_terms: D001555:Benzene Derivatives / Q000737:chemistry; D001897:Boronic Acids / Q000737:chemistry*; D017554:Carbon Compounds, Inorganic; D055598:Chemical Phenomena; D003300:Copper; D003460:Crystallization; D004146:Dioxanes / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D010616:Phenanthrenes / Q000737:chemistry*; D011208:Powders; D017655:Silicon Compounds; D012822:Silicon Dioxide; D013057:Spectrum Analysis; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: C557560:1,4-phenylenebis(boronic acid); C557559:2,3,6,7,10,11-hexahydroxytriphenylene; D001555:Benzene Derivatives; D001897:Boronic Acids; D017554:Carbon Compounds, Inorganic; D004146:Dioxanes; D010616:Phenanthrenes; D011208:Powders; D017655:Silicon Compounds; D012822:Silicon Dioxide; D006108:Graphite; D003300:Copper; C010219:mesitylene; C025223:1,4-dioxane; C022088:silicon carbide