1. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Barsausko 59, Kaunas LT-51423, Lithuania
2. Department of Chemistry and Nanomaterials Science, Bohdan Khmelnytsky National University, Cherkasy 18031, Ukraine
3. Department of Physics and Astronomy, Uppsala University, Lagerhyddsvagen 1, Uppsala SE-75121, Sweden