1. Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
2. Polymer program, Institute of Materials Science, University of Connecticut, 25 King Hill Road, Unit 3136, Storrs, Connecticut 06269-3136, United States
3. Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
4. Department of Materials Engineering, Ming-Chi University of Technology, 84 Gungjuan Rd., Taishan Dist, New Taipei City 243303, Taiwan