A mechanism for the formation of annealed compact oxide layers at the interface between anodic titania nanotube arrays and Ti foil

Chien Chon Chen, Wen C. Say, Sheng Jen Hsieh, Wei-Guang Diau

研究成果: Article同行評審

17 引文 斯高帕斯(Scopus)

摘要

We propose a mechanism for the growth of crystalline anodic titanium-oxide (ATO) nanochannel arrays based on thermodynamic considerations and structural imperfections. Both amorphous and crystalline ATO films were obtained from the anodization of a titanium foil. Amorphous ATO nanotubes have a single-layer form, which makes them inefficient for use in photo-catalytic and solar-cell applications. Annealed ATO nanotubes are considered non-stoichiometric if the effect of oxygen partial pressure on the composition is significant. The driving force behind growing crystalline ATO nanotubes is the drawing of oxygen from the atmosphere to the oxygen site, which consequently decreases the concentration of oxygen vacancies in the anatase phase. The small ionization energies of titanium ions produce the stoichiometric defects. A diagram showing Gibbs energy and Kroger-Vink notation to indicate the strong influence of the non-stoichiometric ATO structure is deduced.

原文English
頁(從 - 到)889-898
頁數10
期刊Applied Physics A: Materials Science and Processing
95
發行號3
DOIs
出版狀態Published - 1 六月 2009

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