1. Faculty of Engineering, Bar-Ilan University, 52900 Ramat-Gan, Israel.
2. Institue of Nanotechnology and Advanced Materials, Bar-Ilan University, 52900 Ramat-Gan, Israel.
3. Department of Electrical Engineering, Yale University, New Haven, CT 06511, USA.
4. Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA.
5. Materials Science and Engineering Graduate Program, University of Massachusetts, Amherst, MA 01003, USA.