1. Department of Medico-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Corso della Repubblica 79, 04100 Latina, Italy
2. CNR-Lab. Licryl, Institute NANOTEC, 87036 Arcavacata di Rende, Italy
3. Beam Engineering for Advanced Measurements Company, Orlando, Florida 32810, United States
4. Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright- Patterson Air Force Base, Ohio 45433-7707, United States
5. CNR-IPCF, National Research Council of Italy, Institute for Physical and Chemical Processes—Bari Division, Via Orabona 4, I-70126 Bari, Italy
6. Department of Chemistry, University of Bari “A. Moro”, Via Orabona 4, I-70126 Bari, Italy