1. Beijing National Laboratory for Molecular Sciences Department of Applied Chemistry Center for the Soft Matter Science and Engineering and the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education College of Chemistry Peking University Beijing 100871 China
2. Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction Hong Kong University of Science and Technology (HKUST) Clear Water Bay Kowloon Hong Kong
3. HKUST‐Shenzhen Research Institute No. 9 Yuexing 1st RD, Hi‐tech Park Nanshan Shenzhen 518057 China
4. Department of Physics North Carolina State University Raleigh NC 27695 USA