1. Department of Chemistry and Kanbar Laboratory for Nanomaterials at the Bar-Ilan University Center for Advanced Materials and Nanotechnology, Bar-Ilan University, Ramat-Gan 52900, Israel
2. Department of Physics, The Ilse Katz Institute for Nanoscience and Nanotechnology, Ben-Gurion University of the Negev, P.O.Box 653, Beer-Sheva 84105, Israel
3. Institute of Chemistry and Chemical Technology, 660049 Krasnoyarsk, Russia