Graphene functionalisation with a conjugated poly(fluorene) by click coupling: striking electronic properties in solution |
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Authors: | Castelaín Marta Martínez Gerardo Merino Pablo Martín-Gago José Á Segura José L Ellis Gary Salavagione Horacio J |
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Institution: | 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. |
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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. |
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