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International Journal of Photoenergy
Volume 2012, Article ID 638017, 9 pages
http://dx.doi.org/10.1155/2012/638017
Research Article

Anodization Parameters Influencing the Growth of Titania Nanotubes and Their Photoelectrochemical Response

1Centre of Excellence for Catalysis Science and Technology and Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Selangor Darul Ehsan, 43400 Serdang, Malaysia
2Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, Selangor Darul Ehsan, 43400 Serdang, Malaysia
3Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Selangor Darul Ehsan, 43400 Serdang, Malaysia

Received 14 September 2011; Revised 19 November 2011; Accepted 19 November 2011

Academic Editor: Jiaguo Yu

Copyright © 2012 Ying-Chin Lim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

TiO2 nanotubes (TNTs) were fabricated by electrochemical oxidation of Ti foil in a standard two-electrode cell-containing NH4F. The effects of bath temperature, voltage ramp prior to constant voltage held during anodization and present of complexing agent on the crystalline phase, nanotube growth, and dimensional change of TNT were investigated using XRD and FESEM. The results show that tube length decreases with bath temperature attributed to faster chemical dissolution rate at high temperature. However, nanotubes growth rate was enhanced by ~260% with the addition of EDTA as the complexing agent. Meanwhile, the nanotubes diameter was found to be proportionally dependent on bath temperature but independent of the voltage ramp and addition of EDTA. Photoelectrochemical response under illumination was enhanced by using the calcined TNT and is strongly affected by its dimensional changes. Thus, desired properties of TNT can be obtained by tuning the electrochemical condition for a wide-range application.