Abstract
The inertial sliding of physisorbed submonolayer islands on crystal surfaces contains unexpected information on the exceptionally smooth sliding state associated with incommensurate superlubricity and on the mechanisms of its disappearance. Here, in a joint quartz crystal microbalance and molecular dynamics simulation case study of Xe on Cu(111), we show how superlubricity emerges in the large size limit of naturally incommensurate Xe islands. As coverage approaches a full monolayer, theory also predicts an abrupt adhesion-driven two-dimensional density compression on the order of several per cent, implying a hysteretic jump from superlubric free islands to a pressurized commensurate immobile monolayer. This scenario is fully supported by the quartz crystal microbalance data, which show remarkably large slip times with increasing submonolayer coverage, signalling superlubricity, followed by a dramatic drop to zero for the dense commensurate monolayer. Careful analysis of this variety of island sliding phenomena will be essential in future applications of friction at crystal/adsorbate interfaces.
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Acknowledgements
The work in Trieste was carried out under ERC grant 320796 MODPHYSFRICT. Support from Regione Emilia Romagna, Project INTERMECH – MO.RE, SNSF Sinergia contract CRSII2 136287/1 and EU COST Action MP1303 are also acknowledged.
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G.M. conceived the project. G.P., A.diB. and S.V. deposited and characterized the Cu(111) samples. M.P., L.B. and G.M. carried out the QCM experiments and analysed the data. R.G., A.V. and E.T. developed the theoretical model and performed the numerical simulations. All authors discussed the results and contributed to the writing of the manuscript.
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Pierno, M., Bruschi, L., Mistura, G. et al. Frictional transition from superlubric islands to pinned monolayers. Nature Nanotech 10, 714–718 (2015). https://doi.org/10.1038/nnano.2015.106
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DOI: https://doi.org/10.1038/nnano.2015.106
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