1. Department of Chemistry Hong Kong Baptist University Waterloo Road Kowloon Tong Hong Kong P. R. China
2. College of Chemistry and Environmental Engineering Low-dimensional Materials Genome Initiative Shenzhen University Xueyuan Road Shenzhen Guangdong P. R. China
3. State Key Laboratory of Ultra-Precision Machining Technology and Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hung Hom Hong Kong P. R. China
4. Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University (PolyU) Hung Hom Hong Kong P. R. China
5. PolyU Shenzhen Research Institute Shenzhen 518057 P. R. China
6. Department of Applied Physics The Hong Kong Polytechnic University Hung Hom Hong Kong P. R. China
7. Department of Chemistry University of Victoria Victoria BC V8P 5C2 Canada