1. SKKU Advanced Institute
of Nanotechnology (SAINT) and School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon
440-746, Republic of Korea
2. Center for Polymers
and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106-5090,
United States
3. Nano-Mechanical Systems
Research Division, Korea Institute of Machinery and Materials (KIMM), 171 Jang-dong, Yuseong-gu, Daejeon
305-343, Republic of Korea