1. Department of Materials Science and Engineering, Hongik University 72-1, Sangsu-dong, Mapo-gu, Seoul 121-791, Korea
2. Department of Chemical and Biological Engineering, Korea University, Anam-dong, Sungbuk-gu, Seoul 136-713, Korea
3. Department of Polymer Science and Engineering & Department of IT Convergence, Korea National University of Transportation, Chungju 380-702, Korea
4. Carbon Convergence Materials Research Center, Institute of Advanced Composites Materials, Korea Institute of Science and Technology, Jeollabuk-do 565−905, Korea
5. School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
6. Center for Optoelectronic Convergence Systems, Korea Institute of Science and Technology, Seoul 136-791, Korea
7. Display and Nanosystem Laboratory, College of Engineering, Korea University, Seoul 136-713, Korea