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International Journal of Photoenergy
Volume 2013, Article ID 618062, 8 pages
http://dx.doi.org/10.1155/2013/618062
Research Article

Photofunctional Co-Cr Alloy Generating Reactive Oxygen Species for Photodynamic Applications

1Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 120-749, Republic of Korea
2Cellbiocontrol Laboratory, Department of Medical Engineering, College of Medicine, Yonsei University, 250 Seongsanno, Seodaemun-Gu, Seoul 120-752, Republic of Korea
3Brain Korea 21 Project for Medical Science, College of Medicine, Yonsei University, Seoul 120-752, Republic of Korea
4Cardiology Division, Cardiovascular Center, College of Medicine, Yonsei University, Seoul 120-752, Republic of Korea

Received 6 December 2012; Revised 24 February 2013; Accepted 13 March 2013

Academic Editor: Maria da Graça P. Neves

Copyright © 2013 Kang-Kyun Wang 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

We report the fabrication of photofunctional Co-Cr alloy plate that is prepared by a simple modification process for photodynamic application. Photoinduced functionality is provided by the photosensitizer of hematoporphyrin (Hp) that initially generates reactive oxygen species (ROS) such as superoxide anion radical and singlet oxygen. The photosensitizer with carboxyl group was chemically bonded to the surface of the Co-Cr alloy plate by esterification reaction. Microstructure and elemental composition of the Co-Cr alloy plate were checked with scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS). Fabrication of the photofunctionality of the Co-Cr alloy plate was confirmed with X-ray photoelectron spectroscopy (XPS), reflectance UV-Vis absorption, and emission spectroscopy. Reactive oxygen generation from the photofunctional Co-Cr alloy plate was confirmed by using the decomposition reaction of 1,3-diphenylisobenzofuran (DPBF). The results suggest that the immobilized photosensitizer molecules on the surface of Co-Cr alloy plate still possess their optical and functional properties including reactive oxygen generation. To open the possibility for its application as a photodynamic material to biological system, the fabricated photofunctional Co-Cr alloy is applied to the decomposition of smooth muscle cells.