Journal
THIN SOLID FILMS
Volume 519, Issue 6, Pages 1821-1824Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2010.10.004
Keywords
Titanium anodization; Kinetics; Activation energy; Oxygen diffusion; Titania
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Funding
- state of New York through NYSTAR
- National Science Foundation [DMR 0519081]
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We report the kinetics of titania nanotube length evolution during anodization of titanium films. Our results show that the nanotube length increase is thermally activated, and governed by voltage-dependent activation energy 0.6 eV <= E-eff <= 1.1 eV expressed by E-eff = E-0-alpha V-anod where alpha is a constant and E-0=1.6 eV is a voltage-independent term. The proximity of E-0 to that of oxygen diffusion in titania suggests that oxygen transport across the titania walls at the pore bottoms is the rate-limiting step. These results provide insights into the mechanism of titania nanotube formation and a framework for their rational synthesis for applications. (C) 2010 Elsevier B.V. All rights reserved.
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