1. Center for Nanoparticle Research; Institute for Basic Science (IBS); Seoul 151-742 Republic of Korea
2. School of Chemical and Biological Engineering and Institute of Chemical Processes; Seoul National University; Seoul 151-742 Republic of Korea
3. Division of Bio-imaging; Korea Basic Science Institute; Chun-Cheon 200-701 Republic of Korea
4. Department of Chemistry; Seoul National University; Seoul 151-742 Republic of Korea
5. School of Mechanical Engineering; Pusan National University; Busan 609-735 Republic of Korea