1. Intelligent Materials and Systems Laboratory, Faculty of Science and TechnologyUniversity of Tartu, Nooruse 1 50411 Tartu Estonia
2. Institute of Physics, Faculty of Science and TechnologyUniversity of Tartu W. Ostwaldi Street 1 50411 Tartu Estonia
3. Conducting Polymers in Composites and Applications Research Group, Faculty of Applied SciencesTon Duc Thang University Ho Chi Minh City 700000 Vietnam