1. Department of Chemistry, C. Abdul Hakeem College, Melvisharam - 632509, Tamil Nadu, India
2. Department of Chemistry, Auxilium College (Autonomous), Vellore - 632006, Tamil Nadu, India
3. UNESCO-UNISA Africa Chair in Nanoscience's/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa