1. Istituto Nazionale di Ottica (CNR) Via Campi Flegrei, 34 Pozzuoli, Napoli, Italy
2. Department of Chemical Materials and Production Engineering, University of Naples Federico II, PiazzaleTecchio 80 (Naples), Italy
3. Institute for Polymers Composites and Biomaterials, National Council of Research of Italy, Via Campi Flegrei 34, 80078 Pozzuoli, Italy