Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10670536 | Thin Solid Films | 2011 | 4 Pages |
Abstract
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 â¤Â Eeff â¤Â 1.1 eV expressed by Eeff = E0-αVanod where α is a constant and E0 = 1.6 eV is a voltage-independent term. The proximity of E0 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.
Related Topics
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Authors
Gorun Butail, P.G. Ganesan, M. Raddiar, R. Teki, N. Ravishankar, D.J. Duquette, Ganpati Ramanath,