1. University of Zululand; Private Bag X1001 Kwadlangezwa 3886. South Africa
2. Department of Chemistry; Allama Iqbal Open University; Islamabad Pakistan
3. School of Materials; The university of Manchester; Oxford Road United Kingdom M13 9PL.
4. Department of Physics, Nanoscience and Materials Synthesis Lab (NMSL), COMSATS; Institute of Information Technology (CIIT); Chak Shahzad Islamabad Pakistan.