1. Institute of ChemistryJan Kochanowski University 25-405 Kielce Poland
2. Institute of Physics, Faculty of ScienceP. J. Šafárik University Park Angelinum 9 041 54 Košice Slovakia
3. Institute of Nanotechnology (INT)Karlsruhe Institute of Technology (KIT) 76344 Eggenstein-Leopoldshafen Germany