1. School of
Materials Science
and Engineering, Gwangju Institute of Science and Technology, 1 Oryong-Dong, Buk-Gu, Gwangju 500-712, Republic of Korea
2. Nano Carbon Materials Research
Group, Korea Electrotechnology Research Institute (KERI), 12 Bulmosan-ro 10beon-gil, Seongsan-gu, Changwon, Gyeongsangnam-do
642-120, Republic of Korea
3. Department of Physics and Centre
for Plastic Electronics, Imperial College London, London SW7 2AZ, U.K.
4. Department
of Materials Science and
Engineering, Stanford University, Stanford,
California 94305, United States
5. Department of Energy and Materials
Engineering, Dongguk University, 26 Pil-dong,
Jung-gu, Seoul 100-715, Republic of Korea
6. Department of Nanobio Materials
and Electronics, Gwangju Institute of Science and Technology, 1 Oryong-Dong, Buk-Gu, Gwangju 500-712, Republic of Korea