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Open Access Highly Accessed Nano Express

Some aspects of formation and tribological properties of silver nanodumbbells

Boris Polyakov1*, Sergei Vlassov1, Leonid M Dorogin23, Natalia Novoselska4*, Jelena Butikova1, Mikk Antsov23, Sven Oras23, Runno Lohmus23 and Ilmar Kink23

Author Affiliations

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

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Nanoscale Research Letters 2014, 9:186  doi:10.1186/1556-276X-9-186

Published: 21 April 2014

Abstract

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.

PACS

81.07.-b; 62.25.-g; 62.23.Hj