1. Department of Materials Science and Engineering City University of Hong Kong Tat Chee Avenue, Kowloon Tong Hong Kong SAR P. R. China
2. State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 P. R. China
3. Department of Chemistry & Center of Super-Diamond and Advanced Films (COSDAF) City University of Hong Kong Tat Chee Avenue, Kowloon Tong Hong Kong SAR P. R. China
4. Hong Kong Institute of Clean Energy (HKICE) City University of Hong Kong Tat Chee Avenue, Kowloon Tong Hong Kong SAR P. R. China