1. College of Chemistry & Green Catalysis Center Zhengzhou University Zhengzhou 450001 P. R. China
2. National Engineering and Research Center for Advanced Polymer Processing Technology Zhengzhou University Zhengzhou 450001 P. R. China
3. Beijing Key Laboratory of Microstructure and Properties of Solids Institute of Microstructure and Properties of Advanced Materials Beijing University of Technology Chaoyang District Beijing China
4. Institut National de la Recherche Scientifique (INRS)-Energie Mat eriaux et Telecommunications Varennes Quebec J3X 1S2 Canada
5. Institute for Superconducting and Electronic Materials University of Wollongong Wollongong New South Wales 2522 Australia