1. Polymer Institute of the Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovakia
2. Department of Energy Science and Technology, Faculty of Science, Turkish-German University, 106 34820 Istanbul, Turkey
3. Centre for Advanced Materials Application of the Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia