Journal
NANOSCALE
Volume 9, Issue 23, Pages 7911-7921Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr00759k
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Funding
- European Union Seventh Framework program [310184 CARINHYPH]
- European Union structural funds
- Comunidad de Madrid MAD2D-CM Program [S2013/MIT-3007]
- Spanish Ministry of Economy and Competitiveness [MAT2015-71879-P]
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A 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 (oxMWCNTs) 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 an electron scavenger and a hole scavenger, respectively. The results of ultraviolet photoemission spectroscopy (UPS) of the compounds corroborate the findings, highlighting the strong coupling between oxMWCNTs and TiO2 in these hybrids.
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