title: Graphene functionalisation with a conjugated poly(fluorene) by click coupling: striking electronic properties in solution.
abstract: Graphene flakes covalently modified with a conjugated polymer, poly[(9,9-dihexylfluorene)-co-alt-(9,9-bis-(6-azidohexyl)fluorene)] (PFA), were efficiently synthesised by a Cu-catalysed Huisgen 1,3-dipolar cycloaddition between alkyne-modified graphene and an azide-functionalised polymer. Two approaches for the modification of graphene with alkyne groups were investigated (coupling with a diazonium salt generated in situ or an amidation reaction) and the optimum conditions determined. The success of the click-coupling approach was confirmed by FTIR, (1)H NMR, Raman, and X-ray photoelectron spectroscopy (XPS). The absorption and emission spectra of the click product show a strong solvent dependency.
authors.affiliation: Departamento de Física de Polímeros, Elastómeros y Aplicaciones Energéticas, Instituto de Ciencia y Tecnología de Polímeros, CSIC c/Juan de la Cierva, 3, 28006 Madrid, Spain.
authors.forename: Marta
authors.initials: M
authors.lastname: Castelaín
authors.forename: Gerardo
authors.initials: G
authors.lastname: Martínez
authors.forename: Pablo
authors.initials: P
authors.lastname: Merino
authors.forename: José Á
authors.initials: JÁ
authors.lastname: Martín-Gago
authors.forename: José L
authors.initials: JL
authors.lastname: Segura
authors.forename: Gary
authors.initials: G
authors.lastname: Ellis
authors.forename: Horacio J
authors.initials: HJ
authors.lastname: Salavagione
mesh_terms: D000480:Alkynes / Q000737:chemistry*; D004581:Electronics; D005449:Fluorenes / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D056951:Photoelectron Spectroscopy; D011108:Polymers / Q000737:chemistry*; D012996:Solutions; D012997:Solvents / Q000737:chemistry*
chemical_list: D000480:Alkynes; D005449:Fluorenes; D011108:Polymers; D012996:Solutions; D012997:Solvents; C041509:fluorene; D006108:Graphite