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Photocatalytic Bi2O3/TiO2:N Thin Films with Enhanced Surface Area and Visible Light Activity by Dias, Luís P.; Correia, Filipe C.; Ribeiro, Joana M.; Tavares, Carlos J. is a Engineering article available to read on EtoBox.

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Bi2O3 nanocone films functionalized with an overlayer of TiO2 were deposited by d.c. reactive magnetron sputtering. The aforementioned nanocone structures were formed via a vapour-liquid-solid (VLS) growth, starting from a catalytic bismuth seed layer. The resultant nanocones exhibit an improved surface area, measured by atomic force microscopy, when compared to non-VLS deposition of the same metal oxide. X-ray diffraction texture analysis enabled the determination of the crystallographic β-phase of Bi2O3. A very thin TiO2 overlayer (6 nm thick), undoped and doped with nitrogen, was deposited onto the nanocones template, in order to functionalize these structures with a photocatalytic, self-cleaning, cap material. N-doped TiO2 overlayers increased the selective absorption of visible light due to nitrogen doping in the anatase cell, thus, resulting in a concomitant increase in the overall photocatalytic efficiency.

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Author

Dias, Luís P.; Correia, Filipe C.; Ribeiro, Joana M.; Tavares, Carlos J.

Publisher

MDPI AG; Basel: MDPI AG, 2011- (ISSN 2079-6412)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)