Nanoscale surface potential imaging of the photocatalytic TiO2 films on aluminum

Svava Daviðsdóttir, Kai Dirscherl, Stela Canulescu, Rajashekhara Shabadi, Rajan Ambat

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Abstract

The change in the surface potential of TiO2 coatings upon UV-illumination was investigated on the nanoscale using Scanning Kelvin Probe Force microscopy and on the micro-scale using photo-electrochemical measurements. A good correlation between the two techniques was obtained. The changes in the surface potential of TiO2 coatings upon UV-illumination are closely correlated to the band gap and thickness of the coatings. The inhomogeneity surface potential distribution of a 100 nm TiO2 film indicates a heterogeneous coating. Transition to a homogeneous surface potential distribution was observed with increasing thickness of the TiO2 coating.
Original languageEnglish
JournalR S C Advances
Volume3
Issue number45
Pages (from-to)23296-23302
ISSN2046-2069
DOIs
Publication statusPublished - 2013

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