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The Kinetics of Shear-Induced Boundary Film Formation from Dimethyl Disulfide on Copper

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Abstract

The kinetics of the shear-induced surface-to-bulk transport of methyl thiolate species formed from dimethyl disulfide (DMDS) on a copper surface are explored. It is found that the loss of surface species as a function of the number of rubbing cycles can be modeled by assuming that the adsorbed layer penetrates the subsurface a distance of ~0.7 nm per scan. Adding wear to this model does not improve the fit to the experimental data providing an upper limit for the wear rate of ~0.06 nm/scan. This model is applied to analyzing the depth distribution of sulfur within the subsurface region as a function of the number of rubbing cycles, measured by Auger depth profiling when continually dosing the copper sample with DMDS. It is found that the shape of the experimental depth profile is in agreement with the model developed to analyze the surface-to-bulk transport kinetics of the adsorbed layer. However, the profiles are almost identical for surfaces that have been rubbed 130 and 360 times, so that the surface-to-bulk transport kinetics are self limiting.

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Acknowledgments

We gratefully acknowledge the Chemistry Division of the National Science Foundation under Grant Number CHE-9213988 and the Office of Naval Research for support of this work. We also thank Professor David Rigney for extremely useful discussions and suggestions during the course of this work.

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Authors and Affiliations

  1. Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA

    Brendan Miller & Wilfred T. Tysoe

  2. INFAP/CONICET, Universidad Nacional de San Luis, Ejercito de Los Andes 950, 5700, San Luis, Argentina

    Octavio Furlong

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  1. Brendan Miller
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Correspondence to Wilfred T. Tysoe.

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Miller, B., Furlong, O. & Tysoe, W.T. The Kinetics of Shear-Induced Boundary Film Formation from Dimethyl Disulfide on Copper. Tribol Lett 49, 39–46 (2013). https://doi.org/10.1007/s11249-012-0040-7

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