1. Laboratory of Applied Physics
2. Faculty of Sciences
3. University of Sfax
4. Sfax 3000
5. Tunisia
6. Laboratory of Physics of Materials and Nanomaterials Applied to the Environment
7. Faculty of Sciences of Gabes Cité Erriadh
8. University of Gabès
9. 6079 Gabès
10. University of Coimbra
11. CFisUC
12. Physics Department
13. P-3004-516 Coimbra
14. Portugal