1. College of Electronic Science and TechnologyShenzhen University Shenzhen 518060 P. R. China
2. Department of ChemistrySouth University of Science and Technology of China No 1088, Xueyuan Road, Xili, Nanshan District Shenzhen Guangdong 518055 P. R. China
3. Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals Guangdong Institute of Analysis Guangzhou 510070 P. R. China
4. Institute for Advanced StudyShenzhen University Shenzhen 518060 P. R. China