1. State Key
Laboratory for Advanced
Metals and Materials, School of Materials Science and Engineering, USTB, Beijing 100083, China
2. Chemistry Division, PINSTECH, P.O. Office, Nilore, Islamabad, Pakistan
3. Department of Physics, School
of Applied Science, University of Science and Technology Beijing, Beijing 100083, P. R. China
4. Department of Environmental
Sciences, International Islamic University, Islamabad, Pakistan