1. Department of Chemistry, Au×ilium College (Autonomous), Vellore 632006, India
2. Department of Chemistry, C. Abdul Hakeem College, Melvisharam 632509, India
3. The United Nations Educational, Scientific and Cultural Organization-UNISA Africa Chair in Nanoscience’s/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Bo× 392,
Pretoria, 0002, South Africa