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Journal of Nanomaterials
Volume 2011, Article ID 142463, 7 pages
Research Article

Effect of Applied Potential on the Formation of Self-Organized Nanotube Arrays and Its Photoelectrochemical Response

School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia Engineering Campus, Seberang Perai Selatan, Pulau Pinang, 14300 Nibong Tebal, Malaysia

Received 13 July 2011; Accepted 11 August 2011

Academic Editor: Renzhi Ma

Copyright © 2011 Chin Wei Lai and Srimala Sreekantan. 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.


Self-organized TiO2 nanotube arrays have been fabricated by anodization of Ti foil in an electrochemical bath consisting of 1 M of glycerol with 0.5 wt% of NH4F. The effects of applied potential on the resulting nanotubes were illustrated. Among all of the applied potentials, 30 V resulted in the highest uniformity and aspect ratio TiO2 nanotube arrays with the tube's length approximately 1 m and pore's size of 85 nm. TiO2 nanotube arrays were amorphous in as-anodized condition. The anatase phase was observed after annealing at 400 in air atmosphere. The effect of crystallization and effective surface area of TiO2 nanotube arrays in connection with the photoelectrochemical response was reported. Photoelectrochemical response under illumination was enhanced by using the annealed TiO2 nanotube arrays which have larger effective surface area to promote more photoinduced electrons.