1. School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
2. Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR P. R. China
3. State Key Laboratory of Applied Organic Chemistry (SKLAOC) Key Laboratory of Special Function Materials and Structure Design (MOE) and College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China