1. Department of Physics University of Agriculture and Environmental Sciences Owerri Nigeria
2. Department of Physics and Astronomy University of Nigeria Enugu Nigeria
3. National Center for Physics, Quaid‐i‐Azam University Islamabad Pakistan
4. Nanosciences African Network (NANOAFNET) iThemba LABS‐National Research Foundation Somerset West South Africa
5. Department of Physics Federal University of Technology Owerri Nigeria
6. Department of Pure and Industrial Chemistry University of Nigeria Enugu Nigeria
7. Department of Physics Federal College of Education Enugu Nigeria
8. UNESCO‐UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies, University of South Africa Pretoria South Africa