1. State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and Functionalization International Research Center for X Polymers Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
2. Frontier Institute of Science and Technology Xi'an Jiaotong University Xi'an 710054 P. R. China
3. State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 P. R. China
4. Department of Physics Chinese University of Hong Kong New Territories Hong Kong 999077 P. R. China
5. i‐Lab & Printable Electronics Research Centre Suzhou Institute of Nano‐tech and Nano‐bionics Chinese Academy of Sciences Suzhou 215123 P. R. China
6. Department of Chemistry Zhejiang University Hangzhou 310027 P. R. China