1. School of Chemistry and Chemical Engineering National Special Superfine Powder Engineering Research Center Nanjing University of Science and Technology Nanjing 210094 P. R. China
2. School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore
3. Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
4. School of Chemistry and Chemical Engineering Institute for Energy Research Jiangsu University Zhenjiang 212013 P. R. China
5. National Synchrotron Radiation Laboratory CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei Anhui 230029 P. R. China
6. Laboratory of Soft Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
7. School of Electrical and Electronic Engineering and The Photonics Institute Nanyang Technological University Singapore 639798 Singapore
8. CINTRA CNRS/NTU/THALES UMI 3288 Research Techno Plaza Singapore Singapore