1. Institute for Nanoscience and Nanotechnology
2. Sharif University of Technology
3. Tehran 14588
4. Iran
5. Department of Physics
6. Department of Chemistry-Ångström Laboratory
7. Uppsala University
8. SE-751 20 Uppsala
9. Sweden
10. Nanotechnology and Advanced Materials Department
11. Materials and Energy Research Center
12. Karaj 31787-316