1. PG and Research Department of Chemistry, Presidency College (Autonomous), Chennai 600005, Tamil Nadu, India
2. PG Research and Department of Chemistry, Auxilium College (Autonomous), Vellore 632006, India
3. Department of Chemistry, St. Xavier’s College (Autonomous), Tirunelveli 627002, India
4. 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, 0003, South Africa
5. Department of Physics, University of Botswana, Private Bag 0022, Gaborone, Botswana
6. School of Chemistry and Physics, University of Kwazulu-Natal, Private Bag X01, Scottsville 3209, Pietermaritzburg, South Africa