Abstract
The temperature-dependent friction and wear of magnetron-sputtered MoS2/Sb2O3/Au nanocomposites was investigated in the range −150 to 150 °C using macroscale experiments. We investigate the origin of recent reports suggesting the existence of a relatively high friction (µ ~ 0.2) transition for these nanocomposites at temperatures below −20 °C, contrasting with the characteristic ultra-low friction behavior (µ < 0.01) for pure and composite MoS2 films in vacuum and inert gas environments at room temperature. We present evidence suggesting that the ability to form and maintain basally oriented low-friction surface films is increasingly compromised with decreasing temperature, and show that low friction is achievable at cryogenic temperatures.
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Acknowledgments
The authors would like to thank Somuri V. Prasad and Michael T. Dugger for helpful conversations about the friction behavior of MoS2 in extreme environments, Rand Garfield for sample preparation and assistance with fabrication of cryogenic flow cell, and Angela Pitenis, Morgan Jones and W. Gregory Sawyer for insightful conversations about previous research efforts to understand the molecular origins of friction of 2D materials. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.
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Curry, J.F., Babuska, T.F., Brumbach, M.T. et al. Temperature-Dependent Friction and Wear of MoS2/Sb2O3/Au Nanocomposites. Tribol Lett 64, 18 (2016). https://doi.org/10.1007/s11249-016-0748-x
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DOI: https://doi.org/10.1007/s11249-016-0748-x