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Frictional dynamics of perfluorinated self-assembled monolayers on amorphous SiO2

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Abstract

Silicon micromachines in microelectromechanical systems (MEMS) are coated with self-assembled monolayers (SAMs) in order to reduce the wear and stiction that are commonplace during operation. Recently, perfluorinated SAMs have been the focus of attention because they have better processing properties than hydrocarbon SAMs. In this study, we perform molecular dynamics simulations that model adhesive contact and friction for perfluorinated alkylsilane (Si(OH)3(CF2)10CF3) self-assembled monolayers (SAMs), which are commonly used in MEMS devices. Amorphous silica is used as the substrate for the SAMs in the simulations. The frictional behavior is investigated as a function of applied pressure (50 MPa–1 GPa) for a shear velocity of 2 m/s and compared to recent simulation results of hydrocarbon alkylsilane SAMs. The microscopic friction coefficient for the perfluorinated SAMs is the same as was measured for the hydrocarbon SAMs, but the shear stress is slightly larger than in the case of the hydrocarbon SAMs on amorphous silica.

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Authors and Affiliations

  1. Sandia National Laboratories, Albuquerque, NM, 87185, USA

    C.D. Lorenz, E.B. Webb III, M.J. Stevens, M. Chandross & G.S. Grest

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  1. C.D. Lorenz
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  2. E.B. Webb III
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  3. M.J. Stevens
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  4. M. Chandross
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  5. G.S. Grest
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Correspondence to C.D. Lorenz.

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Lorenz, C., Webb, E., Stevens, M. et al. Frictional dynamics of perfluorinated self-assembled monolayers on amorphous SiO2. Tribol Lett 19, 93–98 (2005). https://doi.org/10.1007/s11249-005-5085-4

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  • DOI: https://doi.org/10.1007/s11249-005-5085-4

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