1. Carbon Convergence Materials Research Center; Institute of Advanced Composites Materials, Institute of Science and Technology; Eunha-ri san 101, Bondong-eup, Wanju-gun Jeollabuk-do 565-905 Republic of Korea
2. Department of Chemistry and Department of Carbon Materials; Chosun University; 375 Seosuk-dong, Dong-gu Gwangju 501-759 Republic of Korea
3. Department of Polymer Science and Engineering; Graduate School of Science and Engineering, Yamagata University; Yonezawa 992-8510 Japan