1. School of Physics and Materials Science, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, P. R. China
2. Jiangxi Science & Technology Normal University, Nanchang 330013, Jiangxi, P. R. China
3. School of Chemistry and Chemical Engineering, Institute of Polymers and Energy Chemistry, Nanchang University, Nanchang 330031, P. R. China