1. Carbon Convergence Materials Research Center; Institute of Advanced Composites Materials, Korea Institute of Science and Technology; Eunha-ri san 101, Bondong-eup Wanju-gun Jeollabuk-do 565-905 Korea
2. Department of Organic Materials and Fiber Engineering; Chonbuk National University; Duckjin-dong 1 Ga Jeonju Jeollabuk-do 561-756 Korea
3. Department of Materials Science and Engineering; Hongik University 72-1; Sangsu-dong Mapo-gu 121-791 Korea