1. Central European Institute of Technology, Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic
2. Department of Chemistry and Chemical Technology, K. Marx 20, Novosibirsk State Technical University, 630073 Novosibirsk, Russia
3. Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlářská 2, CZ-61137 Brno, Czech Republic
4. Central European Institute of Technology, Brno University of Technology, Technická 3058/10, CZ-61600 Brno, Czech Republic
5. Centre of Sensors, Information and Communication Systems, Faculty of Electrical Engineering and Communication, Technická 3058/10, CZ-61600 Brno, Czech Republic
6. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, CZ-61662 Brno, Czech Republic