1. Department of Physics and Astronomy University of Nigeria Nsukka Nigeria
2. SensorLab University of the Western Cape Sensor Laboratories Cape Town South Africa
3. National Centre for Energy Research and Development University of Nigeria Nsukka Nigeria
4. UNESCO‐UNISA Africa Chair in Nanosciences‐Nanotechnology, College of Graduate Studies University of South Africa Muckleneuk Ridge South Africa
5. Nanosciences African Network (NANOAFNET) iThemba LABS‐National Research Foundation Somerset West South Africa