1. Advanced Materials Research Lab Department of Basic and Applied Sciences Punjabi University Patiala Punjab 147 002 India
2. Department of Physics Punjabi University Patiala Punjab 147 002 India
3. Department of Nanotechnology Sri Guru Granth Sahib World University Fatehgarh Sahib 140 407 Punjab India
4. Department of Physics University of Petroleum and Energy Studies Dehradun Uttarakhand 248 007 India