1. Department of Chemistry and State Key Laboratory of Marine Pollution Hong Kong Institute for Advanced Study City University of Hong Kong Hong Kong 999077 P. R. China
2. Department of Materials Science and Nanoengineering Rice University Houston TX 77005 USA
3. Institute of Advanced Magnetic Materials College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou 310012 P. R. China
4. Shenzhen Futian Research Institute City University of Hong Kong Shenzhen 518048 P. R. China
5. Department of Materials Science and Engineering City University of Hong Kong Hong Kong 999077 P. R. China
6. School of Chemistry and Chemical Engineering Northwestern Polytechnical University Xi'an 710072 P. R. China
7. School of Science and Engineering Shenzhen Institute of Molecular Aggregate Science and Technology The Chinese University of Hong Kong Shenzhen Guangdong 518172 P. R. China
8. City University of Hong Kong Shenzhen Research Institute Shenzhen 518057 P. R. China