1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
2. University of the Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3. Physics and Electronic Engineering College, Nanyang Normal University, Nanyang 473061, People’s Republic of China
4. Department of Macromolecular Science and Engineering, Case School of Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States