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Interfacial Charge Transfer in Functionalized Multi-walled Carbon Nanotube@TiO2 nanofibres

Abstract

New insight into photoinduced charge transfer processes across carbon nanotube@TiO2 interfaces has been gained based on experimental details from transient absorption spectroscopy. We show that photoinduced, interfacial hole transfer to carboxylic acid-functionalized multiwalled carbon nanotubes (oxMWCNT) from TiO2 results in hole-doped oxMWCNTs and reduced TiO2. The latter is inferred from femto- and nanosecond transient absorption spectroscopy performed with oxMWCNT@TiO2 dispersions and complemented with investigations using methyl viologen and N,N,N′,N′-tetramethyl-p-phenylenediamine as electron scavenger and hole scavenger, respectively. Results of ultraviolet photoemission spectroscopy (UPS) of the compounds corroborate the findings, highlight the strong coupling between CNTs and TiO2 in these hybrids.

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Publication details

The article was received on 01 Feb 2017, accepted on 25 Apr 2017 and first published on 28 Apr 2017


Article type: Paper
DOI: 10.1039/C7NR00759K
Citation: Nanoscale, 2017, Accepted Manuscript
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    Interfacial Charge Transfer in Functionalized Multi-walled Carbon Nanotube@TiO2 nanofibres

    A. Saha, A. Moya, A. Kahnt, D. Iglesias, S. Marchesan, R. Wannemacher, M. Prato, J. Vilatela and D. M. Guldi, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR00759K

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