1. State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua University Shanghai 201620 China
2. Department of Applied PhysicsDonghua University No. 2999, North Renmin Road, Songjiang District Shanghai 201620 China
3. Department of ChemistryNational University of Singapore 3 Science Drive 3 Singapore 117543 Singapore