1. University of Novi Sad, Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, 21000 Novi Sad, Serbia
2. University of Novi Sad, Faculty of Sciences, Department of Physics, 21000 Novi Sad, Serbia
3. University of Novi Sad, Faculty of Technical Sciences, Department of Electronics, 21000 Novi Sad, Serbia
4. Center for Solid State and New Materials, Institute of Physics Belgrade, 11000 Belgrade, Serbia