Atomic-Scale Observation of Superlubricity

Dienwiebel, Martin; Verhoeven, Gertjan S.; Pradeep, Namboodiri; Zandbergen, H.W.; Frenken, J.W.M.

doi:10.1115/wtc2005-64003

Cited by 43 publications

(62 citation statements)

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“…Furthermore, the mean friction obtained at different normal loads not only is relatively low but also barely increases with F N , as observed in our experiments. These trends are consistent with previous experimental 4, 25 and theoretical 23 work in UHV.…”

Section: Resultssupporting

confidence: 93%

“…Strikingly, these same results are reproduced by the simulations in water. Not only do we observe the same stick−slip behavior obtained in vacuum, 23,25 but also the contrast turns out to be similar in the two environments. This agreement is better appreciated in Figure 2C, which shows that the only remarkable difference between vacuum and water friction curves is the larger fluctuations on the latter around otherwise similar values.…”

Section: Resultssupporting

confidence: 80%

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Atomic-Scale Sliding Friction on Graphene in Water

et al. 2016

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The sliding of a sharp nanotip on graphene completely immersed in water is investigated by molecular dynamics (MD) and atomic force microscopy. MD simulations predict that the atomic-scale stick-slip is almost identical to that found in ultrahigh vacuum. Furthermore, they show that water plays a purely stochastic role in sliding (solid-to-solid) friction. These observations are substantiated by friction measurements on graphene grown on Cu and Ni, where, oppositely of the operation in air, lattice resolution is readily achieved. Our results promote friction force microscopy in water as a robust alternative to ultra-high-vacuum measurements.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 80%

Atomic-Scale Sliding Friction on Graphene in Water

et al. 2016

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“…12 −15 Most of the studies concentrate on friction measurements in the elastic regime, i.e. below the critical load at which observable damage might take place.…”

Section: Introductionmentioning

confidence: 99%

Friction Force Microscopy Analysis of Self-Adaptive W–S–C Coatings: Nanoscale Friction and Wear

Zekonyte

Polcar

2015

ACS Appl. Mater. Interfaces

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Transition metal dichalcogenides (TMD) are increasingly popular due to unique structural and mechanical properties. They belong, together with graphene and similar 2D materials, to a small family of solid lubricants with potential to produce ultralow friction state. At the macroscale, low friction stems from the ability to form well-oriented films on the sliding surface (typically up to 10 nm thick), with the TMD basal planes aligned parallel to the surface. In this study, we quantitatively evaluate tribological properties of three sputtered tungsten-sulfur-carbon (W-S-C) coatings at a nanoscale using friction force microscopy. In particular, we investigate possible formation of well-ordered tungsten disulfide (WS2) layers on the coating surface. The coefficient of friction decreased with increasing load independently of coating composition or mechanical properties. In contrast, hard coatings with high tungsten carbide content were more resistant to wear. We successfully identified a WS2 tribolayer at the sliding interface, which peeled off as ultrathin flakes and attached to AFM tip. Nanoscale tribological behavior of WSC coatings replicates deviation of Amonton's law observed in macroscale testing and strongly suggests that the tribolayer is formed almost immediately after the start of sliding.

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“…1−3 Applications can be found in microelectronics, 4,5 catalysis, 6−8 and tribology. 9,10 Although the attractive properties of the pure compounds are widely known, recent efforts have been focusing on the physics and properties emerging from the stacking degree of freedom offered by these lamellar materials. Different types of single layers can be mixed and matched to create new superstructures, termed heterostructures.…”

Section: ■ Introductionmentioning

confidence: 99%

Exploring the Stability of Twisted van der Waals Heterostructures

Silva

Claerbout

Polcar

et al. 2020

ACS Appl. Mater. Interfaces

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Recent research showed that the rotational degree of freedom in stacking 2D materials yields great changes in the electronic properties. Here, we focus on an often overlooked question: are twisted geometries stable and what defines their rotational energy landscape? Our simulations show how epitaxy theory breaks down in these systems, and we explain the observed behavior in terms of an interplay between flexural phonons and the interlayer coupling, governed by the moirésuperlattice. Our argument, applied to the well-studied MoS 2 /graphene system, rationalizes experimental results and could serve as guidance to design twistronic devices.

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Atomic-Scale Observation of Superlubricity

Cited by 43 publications

References 0 publications

Atomic-Scale Sliding Friction on Graphene in Water

Atomic-Scale Sliding Friction on Graphene in Water

Friction Force Microscopy Analysis of Self-Adaptive W–S–C Coatings: Nanoscale Friction and Wear

Exploring the Stability of Twisted van der Waals Heterostructures

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