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Formation of quasi-spherical AU(48-198) clusters in anodic titania nanotubes grown on Ti-Au alloys

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Title: Formation of quasi-spherical AU(48-198) clusters in anodic titania nanotubes grown on Ti-Au alloys
Authors: Sepulveda, M. Browse this author
Castano, J. G. Browse this author
Echeverria, F. Browse this author
Aoki, Y. Browse this author
Kowalski, D. Browse this author
Habazaki, H. Browse this author →KAKEN DB
Keywords: Anodizing
TiO2 nanotubes
Ti-Au alloy
Gold clusters
Issue Date: Nov-2020
Publisher: Elsevier
Journal Title: Electrochemistry Communications
Volume: 120
Start Page: 106847
Publisher DOI: 10.1016/j.elecom.2020.106847
Abstract: The effect of alloying sputter-deposited Ti with 2 at.% of Au on the growth of anodic nanotubes was studied in monoethylene glycol electrolyte containing 1.0 mol dm(-3) of water and 0.1 mol dm(-3) of ammonium fluoride. The classic shape of nanotubes modified with quasi-spherical clusters of Au48-198 was obtained on Ti-Au (2 at.%). The results were compared to the formation of a barrier-type anodic film which suggested that gold located at the alloy/anodic film interface is enriched as a consequence of the preferential oxidation of titanium during the prior anodizing period and transported to the cell boundary region of the nanotubular film in the form of quasispherical clusters of Au48-198. A consequence of the inclusion of Au48-198 in the structure of the nanotubes was a reduction in the rate of nanotubular film growth due to the generation of oxygen catalysed on the clusters. A further increase in gold content up to 8 at.% in the alloy resulted in the formation of sponge-like or nanoporous anodic layers, with the structure depending on electrolyte composition.
Rights: ©2020, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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