1. Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/, Electrophotonic Conversion Materials, School of Chemistry and Chemical EngineeringBeijing Institute of Technology Beijing 100081 P.R. China
2. School of Material Science and EngineeringBeijing Institute of Technology Beijing 100081 P.R. China
3. State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsDonghua University Shanghai 200051 P.R. China