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Journal of Nanomaterials
Volume 2012, Article ID 510672, 6 pages
http://dx.doi.org/10.1155/2012/510672
Research Article

The Effect of Nitrogen-Doped ATO Nanotubes on Radical Multiplication of Buffer Media by Visible Light Photocatalysis Rather UV

1Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan
2Center of Excellence for Marine Bioenvironment and Biotechnology, National Taiwan Ocean University, Keelung 20224, Taiwan
3Institute of Bioscience and Biotechnology, National Taiwan Ocean University, Keelung 20224, Taiwan
4Department of Energy and Resources, National United University, Miaoli 36003, Taiwan
5Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 20224, Taiwan

Received 25 May 2012; Revised 1 September 2012; Accepted 1 September 2012

Academic Editor: Sheng-Rui Jian

Copyright © 2012 Kan-Hung Hu 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

The use of TiO2 in photodynamic therapy for the treatment of cancer has generally been studied in cultured cancer cells in serum-containing RPMI 1640 medium under visible light application rather than ultraviolet (UV) light. An ordered channel array of N-doped anodic titanium dioxide (ATO) has been successfully made for visible light application. ATO nanotubes in the anatase form with a length of 10 μm are more effective than nanotubes of 1.8 μm in length as a photocatalyst for radical multiplication in buffer solution by generating hydroxyl radicals and superoxide radical anions under UV-A exposure. Only the N-doped ATO is applicable to visible light photocatalysis for radical multiplication in RPMI % FBS and acrylamide, a free radical carrier.