1. PG and Research Department of Chemistry, Government Arts College, Tiruvannamalai 606 603, Tamil Nadu, India
2. Nanomaterials Laboratory, Department of Chemistry, International Research Centre, Kalasalingam University, Krishnankoil 626 126, Tamil Nadu, India
3. Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Kanchipuram 603 203, Tamil Nadu, India
4. Department of Chemistry, Karunya Institute of Technology and Sciences, Coimbatore 641 114, Tamil Nadu, India