1. Advanced Materials Research Laboratory, Department of Chemistry; Periyar University; Salem- 636 011, Tamil Nadu India
2. Department of Physics; Periyar University; Salem- 636 011, Tamil Nadu India.
3. Material Science Group, Indra Gandhi; Centre for Atomic Research; Kalpakkam- 603 102, Tamil Nadu India.
4. Centre for Nanoscience and Nanotechnology; Periyar University; Salem- 636 011, Tamil Nadu India.