1. School of Mining and Metallurgical Engineering, National Technical University of Athens, Zografou, Zografou, Athens, Greece
2. Cablel Hellenic Cables S.A., Maroussi, Athens, Greece
3. School of Electrical and Computer Engineering, National Technical University of Athens, Zografou, Athens, Greece
4. Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Agia Paraskevi Attikis, Athens, Greece
5. Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens, Greece