1. Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
2. Polymer Program, Institute Materials Science, Department of Chemical & Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
3. Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
4. Single Molecule Study Laboratory, College of Engineering and Nanoscale Science and Engineering Center, University of Georgia, Athens, Georgia 30602, United States
5. State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin 130012, China
6. Department of Cell Biology, Microbiology and Molecular Biology, University of South Florida, Tampa, Florida 33620, United States
7. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China