1. Department of Chemistry, University of Zululand (KwaDlangezwa Campus), Kwazulu Natal, South Africa
2. Department of Chemistry, University of Kwazulu Natal, Kwazulu Natal, South Africa
3. Department of Physics, Sefako Makgatho Health Sciences University, Medunsa, South Africa
4. Department of Physics, Nelson Mandela University, Port Elizabeth, South Africa
5. Department of Physics, University of the Free State (Qwaqwa Campus), Phuthaditjhaba, South Africa