1. Department of Physics; University of the Free State; Bloemfontein ZA9300 South Africa
2. Department of Physics; Universidade de Brasília; Brasilia DF Brazil-70910900
3. Department of Chemical Engineering; Indian Institute of Technology Kanpur; Kanpur-208016 India
4. Institut National de la Recherche Scientifique-Énergie Matériaux et Télécommunications (INRS-EMT); Quebec, J3×1S2 Canada
5. Advanced Centre for Research in High Energy Materials (ACRHEM); University of Hyderabad; Telangana India
6. Department of Microbial Biochemical and Food Biotechnology; University of the Free State; Bloemfontein ZA 9300 South Africa
7. ENGAGE; University of Pretoria; Pretoria 0002 South Africa