1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, Fujian 350007, P. R. China
2. Fujian Key Laboratory of Functional Marine Sensing Materials, Minjiang University, Fuzhou, Fujian 350108, P. R. China
3. Fujian Provincial Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, Fujian 350007, P. R. China