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International Journal of Photoenergy
Volume 2015 (2015), Article ID 320625, 6 pages
http://dx.doi.org/10.1155/2015/320625
Research Article

Wetting and Photocatalytic Properties of TiO2 Nanotube Arrays Prepared via Anodic Oxidation of E-Beam Evaporated Ti Thin Films

1Department of Physics, University of Ulsan, Ulsan 680-749, Republic of Korea
2Department of Chemical Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea

Received 28 July 2015; Accepted 30 September 2015

Academic Editor: Xuxu Wang

Copyright © 2015 Soon Wook Kim 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 nanotube arrays (TNAs) are fabricated on quartz substrate by anodizing E-beam evaporated Ti films. E-beam evaporated Ti films are directly anodized at various anodizing voltages ranging from 20 to 45 V and their morphological, wetting, and photocatalytic properties are examined. The photocatalytic activity of the prepared TNAs is evaluated by the photodecomposition of methylene blue under UV illumination. The TNAs prepared at an anodizing voltage of 30 V have a high roughness of 30.1 nm and a low water contact angle of 7.5°, resulting in a high photocatalytic performance. The surface roughness of the TNAs is found to correlate inversely with the water contact angle. High roughness (i.e., high surface area), which leads to high hydrophilicity, is desirable for effective photocatalytic activity.