Affiliation: | 1. Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria 2. Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, PO Box 722, Somerset West, 7129, Western Cape Province, South Africa 3. UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), PO Box 392, Muckleneuk ridge, Pretoria, South Africa
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