1. Department of Materials Science and Engineering Faculty of Engineering National University of Singapore Singapore 117574 Singapore
2. Department of Chemical and Biomolecular Engineering Tandon School of Engineering New York University Brooklyn NY 11201 USA
3. Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA
4. Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China
5. Department of Applied Physics The Hong Kong Polytechnic University Hung Hom Hong Kong 999077 P. R. China
6. Institute of Materials Research and Engineering Agency for Science Technology and Research (A* STAR) 2 Fusionopolis Way Innovis 138634 Singapore
7. Department of Mechanical Engineering National University of Singapore Singapore 117575 Singapore
8. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China