1. College of Chemistry
and Pharmaceutical Engineering, Huanghuai University, Zhumadian, Henan 463000, P. R. China
2. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
4. Department of Applied Science and Technology, University of California, Berkeley, California 94720, United States
5. Molecular
Foundry Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
6. Polymer Science and Engineering Department, University of Massachusetts, Amherst, Massachusetts 01003, United States
7. Beijing
Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China