1. MOE Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology 79 Yingze West Street Taiyuan 030024 P. R. China
2. MOE Key Laboratory of Advanced Display and System Applications Shanghai University Shanghai 200072 P. R. China
3. Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University (PolyU) Hung Hom Kowloon Hong Kong P. R. China
4. PolyU Shenzhen Research Institute Shenzhen 518057 P. R. China