Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.43: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Thermolubricity of Xe monolayers on graphene — Matteo Pierno1, •Luca Bignardi2,3, Maria Clelia Righi4, Lorenzo Bruschi1, Stefano Gottardi2, Meike Stöhr2, Pier Luigi Silvestrelli1,5, Petra Rudolf2, and Giampaolo Mistura1 — 1Dept. of Physics and Astronomy, University of Padova, Padova, Italy — 2Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands — 3Physikalisches Institut, University of Münster, Münster, Germany — 4CNR and Dept. of Physics, University of Modena and Reggio, Modena, Italy — 5IOM-CNR, Trieste, Italy
The nanofriction of Xe monolayers deposited on graphene was explored with a quartz crystal microbalance (QCM) at temperatures between 25 and 50 K. Graphene was grown by chemical vapour deposition and transferred to the QCM electrodes with a polymer stamp. At low temperatures, the Xe monolayers are fully pinned to the graphene surface. Above 30 K, the Xe film slides and the coverage beyond which the film starts sliding decreases with temperature. Similar measurements repeated on bare gold show an enhanced slippage of the Xe films and a decrease of the depinning temperature below 25 K. Nanofriction measurements of krypton and nitrogen confirm this scenario. This thermolubric behaviour is explained in terms of a recent theory of the size dependence of static friction between adsorbed islands and crystalline substrates.