1. Faculty of Physics, Department of Physical Electronics, Baku State University, Z.Khalilov street, 23, Baku Az1148, Azerbaijan e-mail:
2. Department of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Rerrich Bela ter 1., Hungary e-mail:
3. Faculty of Physics, Nanomaterials Laboratory, Baku State University, Z.Khalilov street, 23, Baku Az1148, Azerbaijan e-mail:
4. Microelectronics and Materials Physics Laboratories, University of Oulu, P.O. Box 8000FI-90014, Oulu, Finland e-mail:
5. Department of Mechanical Engineering and Materials Science, Rice University, 6100 Main Street, MS-321, Houston, TX 77005 e-mail: