1. Department of Chemistry; Cape Peninsula University of Technology; Cape Town South Africa
2. International and Inter University Centre for Nanoscience and Nanotechnology; Mahatma Gandhi University; Kottayam Kerala India
3. Department of Applied Chemistry; University of Johannesburg; Johannesburg South Africa
4. Centre for Nanomaterials Science Research; University of Johannesburg; Johannesburg South Africa
5. School Pure and Applied Physics, Department for Physics and Chemistry; Mahatma Gandhi University; Kottayam Kerala India
6. School of Chemical Sciences, Department for Physics and Chemistry; Mahatma Gandhi University; Kottayam Kerala India