1. Jawaharlal Nehru Technological University Kakinada, Kakinada, Andhra Pradesh 533 003, India
2. Department of Chemistry, GITAM School of Technology, GITAM University, HTP campus, Rudraram, Medak, Telangana 502 329, India
3. C-MET, IDA Phase II, Cherlapally HCL (PO), Hyderabad, Telangana 500 057, India
4. School of Chemistry & Physics, University of KwaZulu-Natal, P Bag X 54001, Durban 4000, South Africa