1. Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic
of Korea
2. School of Chemical
and Biological
Engineering, Seoul National University,
Seoul 151-742, Republic of Korea
3. School of Advanced Materials Engineering, Kookmin University, Seoul 136-702, Republic of Korea
4. Department of Materials Science
and Engineering, Seoul National University, Seoul 151-744, Republic of Korea