1. School of Chemistry and Chemical Engineering
2. Hunan University
3. 410082 P. R. China
4. College of Physics and Microelectronics
5. State Key Laboratory for Chem/Biosensing and Chemometrics
6. School of Physics and Electronics
7. Key Laboratory of Polar Materials and Devices
8. MOE
9. Department of Electrical Engineering
10. East China Normal University
11. Shanghai 200241
12. School of Materials and Engineering