1. School of Engineering Sciences, Department of Materials Science Engineering, University of Ghana , Ghana
2. Institut des Materiaux Jean Rouxel, Université de Nantes , CNRS UMR 6502, Nantes FR-44322, France
3. School of Engineering Sciences, Department of Biomedical Engineering, University of Ghana , Ghana
4. Department of Physics, Kwame Nkrumah University of Science & Technology , Kumasi, Ghana
5. International Center for Theoretical Physics, Condensed Matter and Statistical Physics , Trieste 34151, Italy
6. School of Natural Sciences, University of Newcastle upon Tyne , Newcastle upon Tyne, UK