1. UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Pretoria, South Africa
2. Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South Africa
3. Department of Physics and Chemistry, Faculty of Sciences and Technologies of Formation and Education, University Cheikh Anta Diop, Dakar, Senegal
4. Centre for Nano Science and Nanotechnology, K.S. Rangasamy College of Technology, Tiruchengode, India
5. Department of Physics, Faculty of Science and Technology, University Cheikh Anta Diop, Dakar, Senegal
6. National Center for Physics, Quaid-i-Azam University, Islamabad, Pakistan