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Nucleation and early growth of anodized TiO2 film

Published online by Cambridge University Press:  31 January 2011

A. Jaroenworaluck ,
D. Regonini ,
C.R. Bowen  and
R. Stevens
A. Jaroenworaluck*
Affiliation:
MTEC: National Metal and Materials Technology Center, Klong Luang, Pathumthani 12120, Thailand
D. Regonini
Affiliation:
Materials Research Centre, Department of Mechanical Engineering, University of Bath, Claverton Down BA2 7AY, United Kingdom
C.R. Bowen
Affiliation:
Materials Research Centre, Department of Mechanical Engineering, University of Bath, Claverton Down BA2 7AY, United Kingdom
R. Stevens
Affiliation:
Materials Research Centre, Department of Mechanical Engineering, University of Bath, Claverton Down BA2 7AY, United Kingdom
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Anodized films of titanium were prepared under different controlled conditions in a water-based electrolyte containing fluorine ions, using either a constant potential or a potential gradually rising to 20 V. The films were then examined using transmission electron microscopy at different stages of growth, in particular, the very early stages of growth (30 s, 200 s, and 10 min) and when the ordered nano-tubular structure was finally established (2–4 h). The use of ramped voltage during the early stages of anodization allowed a well-interconnected porous network to develop and maintained active oxidation throughout anodization. The film, as formed, consisted mainly of amorphous oxide/hydroxides of titanium with small regions of nano-sized crystals. These were found more often in the denser regions of the amorphous network, particularly the arms of the coral-like structure that formed. As the anodized film grew in thickness, the pores tended to become aligned, leading to a surface layer of nanotubes on the electrode material. Electron optical characterization revealed that the nanotubes consist of a stack of rings where the passage of the current had been optimized.

Keywords

CeramicThin filmTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 8 , August 2008 , pp. 2116 - 2124
Copyright
Copyright © Materials Research Society 2008

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