1. Laboratory of Advanced Materials & Devices School of Physics Aristotle University of Thessaloniki Thessaloniki GR‐54124 Greece
2. CHIMAR HELLAS SA 15 km National Road Thessaloniki‐Polygyros, Thermi Thessaloniki GR‐57001 Greece
3. Laboratory of Polymer Chemistry and Technology School of Chemistry Aristotle University of Thessaloniki Thessaloniki GR‐54124 Greece