1. Department of Chemistry University of Zululand Private Bag X1001 3886 Kwadlangezwa South Africa
2. Department of Chemistry Allama Iqbal Open University Islamabad Pakistan
3. School of Science RMIT University GPO Box 2476 3001 Melbourne Victoria Australia
4. School of Materials The University of Manchester Oxford Road M13 9PL Manchester United Kingdom
5. Department of Physics Polymers & Materials Synthesis (PMS) Lab COMSATS Institute of Information Technology (CIIT) Chak Shahzad Islamabad Pakistan