1. Shandong Provincial Key Laboratory of Molecular Engineering School of Chemistry and Chemical Engineering Qilu University of Technology-Shandong Academy of Sciences Jinan, Shandong 250353 P. R. China
2. School of Materials Science & Engineering Qilu University of Technology-Shandong Academy of Sciences Jinan, Shandong 250353 P. R. China
3. School of Electronic and Information Engineering (Department of Physics) Qilu University of Technology-Shandong Academy of Sciences Jinan, Shandong 250353 P. R. China
4. Department of Chemical and Biological Engineering University of British Columbia 2360 E Mall Vancouver, BC Canada V6T 1Z3