1. Department of Nanobio Materials and Electronics, School of Materials Science and Engineering, Energy Storage Laboratory, Research Institute for Solar and Sustainable Energies (RISE), Gwangju Institute of Science and Technology (GIST),
123 Cheomdan-gwagiro (1 Oryong-dong) Buk-gu, Gwangju 500-712, Republic of Korea
2. Daedeok Research Institute, Honam Petrochemical Corporation, 24-1 Jang-dong, Yuseong-gu,
Daejeon 305-726, Republic of Korea