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Single-layer MoS2 roughness and sliding friction quenching by interaction with atomically flat substrates

AuthorsQuereda, J.; Castellanos-Gómez, Andrés ; Agrait de la Puente, Nicolás; Rubio-Bollinger, Gabino
Issue Date7-Aug-2014
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 105(5): 053111 (2014)
AbstractWe experimentally study the surface roughness and the lateral friction force in single-layer MoS2 crystals deposited on different substrates: SiO2, mica, and hexagonal boron nitride (h-BN). Roughness and sliding friction measurements are performed by atomic force microscopy. We find a strong dependence of the MoS2 roughness on the underlying substrate material, being h-BN the substrate which better preserves the flatness of the MoS2 crystal. The lateral friction also lowers as the roughness decreases, and attains its lowest value for MoS2 flakes on h-BN substrates. However, it is still higher than for the surface of a bulk MoS2 crystal, which we attribute to the deformation of the flake due to competing tip-to-flake and flake-to-substrate interactions.
Publisher version (URL)https://doi.org/10.1063/1.4892650
Identifiersdoi: 10.1063/1.4892650
issn: 0003-6951
e-issn: 1077-3118
Appears in Collections:(ICMM) Artículos
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