1. Nanomaterials Research Laboratory, Department of Materials Science & Nanotechnology, D. C. R. University of Science & Technology, Murthal (Sonepat), Haryana 131039, India http://www.dcrustm.ac.in/
2. Department of Physics, D.C.R. University of Science & Technology, Murthal (Sonepat), Haryana 131039, India
3. Center of Excellence for Energy and Environmental Studies, D.C.R. University of Science & Technology, Murthal (Sonepat), Haryana 131039, India
4. M. K. J. K. M. Rohtak, Haryana 131039, India