1. Centre of Polymer and Carbon Materials of the Polish Academy of Sciences, M. Curie-Skłodowskiej 34, 41-819 Zabrze, Poland
2. Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland
3. Institute of Physics, University of Zielona Góra, Z. Szafrana 4a, 65-516 Zielona Góra, Poland
4. Institute of Molecular Physics of the Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland