[1] Univ Ioannina, Dept Phys, GR-45110 Ioannina, Greece
[2] Fdn Res & Technol Hellas, Biomed Res Inst, GR-71110 Iraklion, Crete, Greece
[3] Max Planck Inst Polymer Res, D-55021 Mainz, Germany
[4] Univ Athens, Dept Chem, GR-15771 Athens, Greece
[5] Tokyo Inst Technol, Grad Sch Sci & Engn, Polymer & Organ Mat Dept, Tokyo 1528552, Japan