1. Department
of Materials Science and Engineering, Seoul National University, Daehak-dong, Gwanak-gu, Seoul 151-744, Republic of Korea
2. Marine Energy Convergence & Integration Laboratory, Korea Institute of Energy Research, Gimnyeong-ri, Gujwa-eup, Jeju-si, Jeju-do, 695-971, Republic of Korea
3. Meijo University, Faculty of Science and Technology (University Professor of Nagoya University, NEC Senior Research Fellow & Director, AIST/Nanotube Research Center) 1-501, Shiogamaguchi, Tenpaku, Nagoya, Aichi 468-8502, Japan