1. Department of Polymer Science, College of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
2. Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
3. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
4. South China Advanced Institute for Soft Matter Science and Technology, The School of Molecular Science and Engineering, South China University of Technology, Guangzhou 510640, China
5. Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115, United States
6. X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States