1. Center
for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea
2. Werkstoffe
der Elektrotechnik und CENIDE, Universität Duisburg-Essen, 47057 Duisburg, Germany
3. Materials
Research Institute for Clean Energy, Department of Chemistry and Nano
Sciences, Ewha Womans University, Seoul 120-750, Republic of Korea
4. School of
Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea