1. Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon
2. China
3. Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology
4. Yancheng
5. Shenzhen Research Institute, City University of Hong Kong
6. Shenzhen 518057
7. P. R. China