1. Department of Chemical and Biomolecular Engineering (BK-21 plus) and KAIST Institute for Nanocentury; Korea Advanced Institute of Science and Technology; Daejeon 305-701 Republic of Korea
2. Institute of Advanced Composite Materials; Korea Institute of Science and Technology; 92 Chudongro, Bondong-eup Wanju-gun, Jeonbuk 565-905 Republic of Korea