1. Istituto di Nanotecnologia CNR-Nanotec, Distretto Tecnologico via Arnesano 16, 73100 Lecce, Italy
2. Dipartimento di Matematica e Fisica “E. De Giorgi”, Università del Salento, via per Arnesano, 73100 Lecce, Italy
3. Dipartimento di Fisica, Università degli Studi di Cagliari, I-09042 Monserrato, Italy
4. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
5. Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
6. Department of Chemistry, University of Bari “Aldo Moro”, via Orabona 4, 70126 Bari, Italy
7. Istituto di Nanotecnologia CNR-Nanotec, c/o Department of Chemistry, University of Bari “Aldo Moro”, via Orabona 4, 70126 Bari, Italy