Affiliation: | 1. Nano Hybrids Center, Korea Institute of Science and Technology (KIST), Cheongryang, Seoul P.O. Box 131, Republic of Korea;2. Nanomaterials Science and Engineering, University of Science and Technology, Cheongryang, Seoul P.O. Box 131, Republic of Korea;3. Department of Materials Science and Engineering, KAIST, Daejeon 305–701, Republic of Korea |