1. Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea
2. Department of Chemistry, Amrit Campus, Tribhuvan University, Kathmandu 44613, Nepal
3. O-Sung Co. Ltd., Jeonju 54853, Republic of Korea
4. Department of Organic Material and Fiber Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea