1. Institute of Chemistry, Casali Center for Applied Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
2. Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio 45433, USA
3. Racah Institute of Physics, The Hebrew University of Jerusalem and the Center for Nanoscience and Nanotechnology, Jerusalem 91904, Israel