[1] Univ Cyprus, Dept Chem, CY-1678 Nicosia, Cyprus
[2] Univ Crete, Dept Mat Sci & Technol, Iraklion 71003, Crete, Greece
[3] Fdn Res & Technol Hellas, Inst Elect Struct & Laser, Iraklion 71110, Crete, Greece
[4] Cyprus Inst Neurol & Genet, CY-1683 Nicosia, Cyprus