1. EOLE Laboratory, Faculty of Technology, University of Tlemcen, Bp 230, Tlemcen 13000, Algeria (Corresponding author), e-mail: belabedyoucef@windowslive.com
2. EOLE Laboratory, Faculty of Technology, University of Tlemcen, Bp 230, Tlemcen 13000, Algeria
3. ENSTA Bretagne, IRDL - UMR CNRS 6027, F-29200 Brest, France; and Nanomaterials Laboratory, University of Dayton, 300 College Park, Dayton, OH 45469-0256, USA