Some aspects of formation and tribological properties of silver nanodumbbells
1 Institute of Solid State Physics, University of Latvia, Kengaraga str. 8, Riga LV-1063, Latvia
2 Institute of Physics, University of Tartu, Riia str. 142, Tartu 51014, Estonia
3 Estonian Nanotechnology Competence Center, Riia str. 142, Tartu 51014, Estonia
4 I.I.Mechnikov Odessa National University, Dvoryanskaya str. 2, Odessa 65082, Ukraine
Nanoscale Research Letters 2014, 9:186 doi:10.1186/1556-276X-9-186Published: 21 April 2014
In this paper, metal nanodumbbells (NDs) formed by laser-induced melting of Ag nanowires (NWs) on an oxidized silicon substrate and their tribological properties are investigated. The mechanism of ND formation is proposed and illustrated with finite element method simulations. Tribological measurements consist in controllable real-time manipulation of NDs inside a scanning electron microscope (SEM) with simultaneous force registration. The geometry of NDs enables to distinguish between different types of motion, i.e. rolling, sliding and rotation. Real contact areas are calculated from the traces left after the displacement of NDs and compared to the contact areas predicted by the contact mechanics and frozen droplet models.
81.07.-b; 62.25.-g; 62.23.Hj