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Issue 6, 2018
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Friction induced structural transformations of water monolayers at graphene/Cu interfaces

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Abstract

Tribological and structural properties of water monolayers confined at interfaces between graphene and Cu substrates at cryogenic and room temperatures are extensively studied using molecular dynamics simulations and first-principles calculations. The frictions caused by the sliding of graphene sheets and increasing temperature will reduce the interfacial density of water molecules and lead to structural transformations of water monolayers and direct contacts of graphene with the underlying Cu substrates. Such changes in water structures give rise to higher friction forces and shear strengths at the graphene/Cu interfaces. Depending on the water coverage density and temperature, the motions of graphene on monolayer water covered Cu exhibit stick-slip and continuous slipping behaviors. The strong association of friction characteristics with structural transformations of water molecules could be used to unveil interfacial information of graphene on water adsorbed metal surfaces.

Graphical abstract: Friction induced structural transformations of water monolayers at graphene/Cu interfaces

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Publication details

The article was received on 30 Nov 2017, accepted on 09 Jan 2018 and first published on 09 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP08035B
Citation: Phys. Chem. Chem. Phys., 2018,20, 4137-4143
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    Friction induced structural transformations of water monolayers at graphene/Cu interfaces

    H. Cai, Y. Guo and W. Guo, Phys. Chem. Chem. Phys., 2018, 20, 4137
    DOI: 10.1039/C7CP08035B

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