1. Charles Coulomb Laboratory
2. University of Montpellier
3. 34095 Montpellier Cedex 5
4. France
5. Platform for Research in Nanosciences and Nanotechnology
6. Faculty of Sciences 2
7. Lebanese University
8. BP90239. Jdedeit
9. Lebanon
10. Institute Charles Gerhardt
11. Chimie Moléculaire et Organisation du solide
12. UMR 5253
13. Applied Physics Laboratory
14. BP 90656 Jdedeit