1. Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ulica 17, SI-2000 Maribor, Slovenia
2. Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, Glagoljaška 8, SI-6000 Koper, Slovenia
3. Institute for Environmental Protection and Sensors, Beloruska ulica 7, SI-2000 Maribor, Slovenia
4. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States