1. Brno University of Technology; Brno 616 69 Czech Republic
2. Institute of Physics of Materials; Brno 616 62 Czech Republic
3. Polymer Competence Center Leoben GmbH; Leoben A-8700 Austria
4. CEITEC IPM, Institute of Physics of Materials; Brno 616 62 Czech Republic
5. Montanuniversitaet Leoben; Leoben A-8700 Austria