TiO2 Nanotubes on Transparent Substrates: Control of Film Microstructure and Photoelectrochemical Water Splitting Performance

Language
en
Document Type
Article
Issue Date
2019-08-13
First published
2018-01-15
Issue Year
2018
Authors
Zelny, Matus
Kment, Stepan
Ctvrtlik, Radim
Pausova, Sarka
Kmentova, Hana
Tomastik, Jan
Hubicka, Zdenek
Rambabu, Yalavarthi
Krysa, Josef
Naldoni, Alberto
Editor
Publisher
MDPI
Abstract

Transfer of semiconductor thin films on transparent and or flexible substrates is a highly desirable process to enable photonic, catalytic, and sensing technologies. A promising approach to fabricate nanostructured TiO2 films on transparent substrates is self-ordering by anodizing of thin metal films on fluorine-doped tin oxide (FTO). Here, we report pulsed direct current (DC) magnetron sputtering for the deposition of titanium thin films on conductive glass substrates at temperatures ranging from room temperature to 450 °C. We describe in detail the influence that deposition temperature has on mechanical, adhesion and microstructural properties of titanium film, as well as on the corresponding TiO2 nanotube array obtained after anodization and annealing. Finally, we measure the photoelectrochemical water splitting activity of different TiO2 nanotube samples showing that the film deposited at 150 °C has much higher activity correlating well with the lower crystallite size and the higher degree of self-organization observed in comparison with the nanotubes obtained at different temperatures. Importantly, the film showing higher water splitting activity does not have the best adhesion on glass substrate, highlighting an important trade-off for future optimization.

Journal Title
Catalysts
Volume
8
Issue
1
Citation
Catalysts 8.1 (2018). <https://www.mdpi.com/2073-4344/8/1/25>
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