1. Department of Polymer Engineering
2. Pukyong National University
3. Busan 608-739
4. Republic of Korea
5. Graduate School of Nanoscience and Technology
6. Center for Nature-inspired Technology in KAIST Institute for the NanoCentury
7. KAIST
8. Daejeon
9. Department of Chemical Engineering
10. Kyung Hee University
11. Yongin-si