1. Faculty of Chemistry, Silesian University of Technology, Strzody 9, 44-100 Gliwice, Poland
2. Centre of Polymer and Carbon Materials, Polish Academy of Sciences, Curie-Sklodowskiej 34, 41-819 Zabrze, Poland
3. Centre for Organic and Nanohybrid Electronics, Silesian University of Technology, Konarskiego 22B, 44-100 Gliwice, Poland
4. Department of Physics, Durham University, South Road, Durham DH1 3LE, UK