1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 P. R. China
2. State Key Lab Modificat Chem Fibers & Polymer Mat, Res Ctr Anal & Measurement Donghua University Shanghai 201620 P. R. China
3. College of Integrated Circuits and Optoelectronic Chips Shenzhen Technology University Shenzhen 518118 P. R. China
4. Department of Physics Donghua University Shanghai 201620 P. R. China