1. School of Physics and Microelectronics Zhengzhou University 100 Science Road Zhengzhou 450001 P. R. China
2. Research Center of Green Catalysis College of Chemistry Zhengzhou University 100 Science Road Zhengzhou 450001 P. R. China
3. College of Science Henan Agricultural University Zhengzhou Henan 450002 P. R. China
4. Department of Chemistry The Women University Kutchery Campus, L.M.Q. Road Multan 66000 Pakistan
5. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety National Center for Nanoscience and Technology Beijing 100190 P. R. China
6. Department of Chemistry Tsinghua University Beijing 100084 P. R. China