1. Department of Chemistry, Auxilium College, Vellore 632006, India
2. Department of Chemistry, C. Abdul Hakeem College, Melvisharam 632509, India
3. UNESCO-UNISA Africa Chair in Nanoscience’s/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, Pretoria - 0001, South Africa