1. Department of Physics, PSG Institute of Technology and Applied Research, Coimbatore, Tamilnadu, India
2. Department of Physics, Thanthai Periyar Government Institute of Technology, Vellore, Tamilnadu, India
3. Materials Research Center, Coimbatore, India
4. Department of Physics, SriGuru Institute of Technology, Coimbatore, Tamilnadu, India
5. Department of Chemistry, Government College of Technology, Coimbatore, Tamilnadu, India