1. Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Aghia
Paraskevi, Athens 153 10, Greece
2. Department of Chemical Sciences, School of Chemical Engineering, National Technical University of Athens, Iroon Polytexneiou 9, Athens 157 80, Greece
3. Department of Chemical Engineering, University of Patras, University Campus, Patras 26504, Greece
4. Department of Solid
State Physics, National and Kapodistrian University of Athens, University Campus, Zografos, Athens 157 84, Greece