1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, P.R. China
2. Institue of Education, University College London, London, UK
3. Research and Development Department, Guangdong Bomin Sci-Tech Co., Ltd., Meizhou, P.R. China
4. State Key Lab of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China (UESTC), Chengdu, P.R. China