1. Physics & Chemistry Department, Technical University of Cluj-Napoca, 400114 Cluj-Napoca, Romania
2. Interdisciplinary Research Institute in Bio-Nano-Sciences, Babes-Bolyai University, 42 Treboniu Laurian, 400271 Cluj-Napoca, Romania
3. National Institute for R&D of Isotopic and Molecular Technologies, 67-103 Donat, 400293 Cluj-Napoca, Romania