1. Department of Materials Science and Engineering Hongik University 72-1; Sangsu-dong Mapo-gu Seoul 121-791 Korea
2. School of Chemical and Biomolecular Engineering
3. Department of Polymer Science and Engineering; Korea National University of Transportation; Chungju 380-702 Republic of Korea
4. 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
5. School of Chemistry and Biochemistry
6. School of Materials Science and Engineering; Georgia Institute of Technology; Atlanta Georgia 30332-0100 USA