Frictional Anisotropy of Metal Nanoparticles Adsorbed on Graphene

Authors	A.V. Khomenko¹^,², N.V. Prodanov¹^,³^,⁴, M.A. Khomenko¹, B.O. Krasulya¹
Affiliations
Е-mail	khom@mss.sumdu.edu.ua, prodk@rambler.ru
Issue	Volume 5, Year 2013, Number 3
Dates	Received 17 March 2013; revised manuscript received 01 July 2013; published online 12 July 2013
Citation	A.V. Khomenko, N.V. Prodanov, M.A. Khomenko, B.O. Krasulya, J. Nano- Electron. Phys. 5 No 3, 03018 (2013)
DOI
PACS Number(s)	6.55. + d, 62.20.Qp, 81.40.Pq, 68.35.Af, 68.37.Ps, 61.72.Hh
Keywords	Nanotribology, Molecular dynamics, Nanoparticle (77) , Friction force, Atomic force microscopy (9) , Graphene (23) .
Annotation	Friction force acting on silver and nickel nanoparticles sheared on a graphene sheet in different lateral directions is investigated using classical molecular dynamics simulations. The results reveal the existence of frictional anisotropy for both metals. In most cases, the maximum value of the friction force is about two times larger than the minimum one. The form of dependencies of instantaneous values of the friction force components on the corresponding lateral components of the position of the centre of mass of the nanoislands strongly depends on sliding direction, varying between the sawtooth and the irregular one. A qualitative explanation of the results based on the “patch” model is proposed.
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