1. Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.
2. Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA.
3. Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
4. Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA.
5. Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305, USA.
6. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
7. Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA.
8. Department of Chemistry and RINS, Gyeongsang National University, Jinju 660-701, South Korea.
9. Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
10. Samsung Advanced Institute of Technology Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea.