1. Center of Research on Microelectronics and Nanotechnology of Sousse, Technopark of Sousse, B.P. 334, Tunisia
2. Laboratory of Physical-Chemistry of Mineral Materials and their Applications, National Center of Research on Sciences of Materials, B.P. 95 Hammam-Lif 2050, Tunisia
3. Institute of Materials Microelectronics Nanosciences of Province, University of South Toulon Var, La Garde Cedex 83957, France