1. Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
2. State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
3. Department of Chemistry University of North Carolina at Chapel Hill Chapel Hill NC 27599‐3290 USA
4. Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology Beijing 100190 China
5. School of Chemistry and Chemical Engineering Henan Normal University Xinxiang 453007 China