1. Department of Chemistry, Stanford University, Stanford, California 94305, United States
2. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
3. State Key Laboratory of Chemical Resource Engineering and Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
4. Institute of Materials Science and Engineering, National Central University, Taoyuan 32001, Taiwan
5. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
6. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan