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Superlubricity of a graphene/MoS2 heterostructure: a combined experimental and DFT study

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Abstract

Graphene and other two-dimensional materials have been proved to be able to offer low friction. Here we assembled van der Waals heterostructures with graphene and molybdenum disulphide monolayers. The Raman spectrum together with a modified linear chain model indicate a two-orders-of-magnitude decrease in the interlayer lateral force constant, as compared with their homogeneous bilayers, indicating a possible routine to achieve superlubricity. The decrease in the interlayer lateral force constant is consistent with the ultrasmall potential energy corrugation during sliding, which is derived from density functional theory calculations. The potential energy corrugation is found to be determined by the sliding-induced interfacial charge density fluctuation, suggesting a new perspective to understand the physical origin of the atomic scale friction of two-dimensional materials.

Graphical abstract: Superlubricity of a graphene/MoS2 heterostructure: a combined experimental and DFT study

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Publication details

The article was received on 28 Feb 2017, accepted on 02 Jul 2017 and first published on 04 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR01451A
Citation: Nanoscale, 2017, Advance Article
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    Superlubricity of a graphene/MoS2 heterostructure: a combined experimental and DFT study

    L. Wang, X. Zhou, T. Ma, D. Liu, L. Gao, X. Li, J. Zhang, Y. Hu, H. Wang, Y. Dai and J. Luo, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR01451A

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