1. University of Sfax, Faculty of Sciences of Sfax, Materials Physics Laboratory, B. P1171, 3000, Sfax, Tunisia
2. I3N-Aveiro, Department of Physics, University of Aveiro, 3810-193, Aveiro, Portugal
3. University of Gabes, Faculty of Sciences of Gabes, Laboratory of Physics of Materials and Nanomaterials Applied to the Environment, Erriadh, 6079, Gabes, Tunisia