1. A Dipartimento di Scienze Chimiche
2. Universita' Catania, and INSTM UdR Catania
3. I-95125 Catania
4. Italy
5. Istituto per la Microelettronica e Microsistemi
6. IMM-CNR
7. 95121 Catania
8. FEMTO-ST Institute
9. University of Bourgogne Franche-Comté CNRS UMR 6174
10. F-25030 Besançon
11. France