1. Division
of Advanced Materials, Korea Research Institute of Chemical Technology, 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea
2. Laboratory
for Photonics and Interfaces, Institute of Chemical Sciences and Engineering,
School of Basic Science, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland
3. Department
of Energy Science, Sungkyunkwan University, Suwon 440-746, Korea