1. Department of Chemistry and
Bioactive Material Sciences and Research Institute of Physics and
Chemistry, Jeonbuk National University, Jeonju, Chonbuk 561-756, Republic of Korea
2. Department of Nano and Advanced
Materials, College of Engineering, Jeonju University, Hyoja-dong, Wansan-ku, Chonju, Chonbuk 560-759, Republic of Korea