1. Department of Chemical and Biological Engineering; William Mong Institute of Nano Science and Technology, and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction; The Hong Kong University of Science and Technology; Clear Water Bay Kowloon 999077 Hong Kong
2. Department of Materials Science and Engineering; University of California-Irvine; Irvine CA 92697 USA
3. Chemical Sciences and Engineering Division; Argonne National Laboratory; 9700 South Cass Avenue Lemont IL 60439 USA
4. Department of Physics and Astronomy; University of California-Irvine; Irvine CA 92697 USA
5. X-ray Science Division; Advanced Photon Source; Argonne National Laboratory; 9700 South Cass Avenue Lemont IL 60439 USA
6. The Smart Materials Research Institute; Southern Federal University; 344090 Rostov-on-Don Russia
7. National Laboratory of Solid State Microstructures; College of Engineering and Applied Sciences; Collaborative Innovation Center of Advanced Microstructures, and Jiangsu Key Laboratory of Artificial Functional Materials; Nanjing University; Nanjing 210093 China