1. Department of Chemistry Education, Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University, Busan, 609-735, Korea
2. Department of Nanomedical Engineering, Pusan National University, Miryang, 627-706, Korea
3. Korea Research Institute of Chemistry Technology, 100 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea