1. Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
2. Interdisciplinary Research Institute on Bio-Nano-Sciences, Babes-Bolyai University, 400271 Cluj-Napoca, Romania
3. INCDO-INOE 2000, Research Institute for Analytical Instrumentation, 400293 Cluj-Napoca, Romania