Speed dependence of friction on single-layer and bulk MoS2 measured by atomic force microscopy

Acikgoz, Ogulcan; Baykara, Mehmet Z.

doi:10.1063/1.5142712

Cited by 34 publications

(20 citation statements)

References 38 publications

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“…The PTT model represents, in a simplified way, the setup of an atomic force microscopy (AFM) experiment, in which a cantilever with a small tip having a radius typically on the order of tens of nanometers is pulled across a periodic crystal surface. Many AFM experiments have reported a nearly-logarithmic increase in friction with increasing sliding speed, consistent with the behavior predicted by the PTT model in the thermal activation regime, for material pairs including Si on mica, 16 Si on gold, 14 Si on NaCl and highly ordered pyrolytic graphite (HOPG), 12,23,24 Si on HOPG, 25 Si on bulk and monolayer MoS2, 26,27 among others. Acikgoz et al have extended the work on the speed dependence of friction for the case of a Si tip sliding on exfoliated monolayer and bulk MoS2.…”

Section: Introductionsupporting

confidence: 71%

Bifurcation of nanoscale thermolubric friction behavior for sliding on MoS2

Hasz

Vazirisereshk

Martini

et al. 2021

Phys. Rev. Materials

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We present atomic force microscopy (AFM) experiments of wearless sliding between nanoscale tips and both bulk and monolayer MoS2 in ultrahigh vacuum across a wide range of temperatures and scanning speeds. Atomic lattice stick-slip behavior is consistently resolved.However, a bifurcation of behavior is seen, with some measurements showing a strong decrease in friction with increasing temperature and others showing athermal and low friction under nominally identical conditions. The difference between thermal and athermal behavior is attributed to a change in the corrugation of the potential energy surface, potentially due to 2 trace amounts of adsorbed contaminants. While the speed dependence at a given temperature is consistent with the thermal Prandtl-Tomlinson model for atomic-scale friction, that is not the case for the temperature dependence (when it is present), nor can the temperature dependence be described by other existing models. We discuss the limitations of these models in light of the measured results.

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Section: Introductionsupporting

confidence: 71%

Bifurcation of nanoscale thermolubric friction behavior for sliding on MoS2

Hasz

Vazirisereshk

Martini

et al. 2021

Phys. Rev. Materials

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show abstract

“…In addition to theoretical and computational work aimed at elucidating the physical reasons behind the lubricative properties of layered materials [133][134][135], there have also been experimental studies that directly probe the underlying mechanisms with high spatial resolution. In addition to electron microscopy studies that manipulated individual sheets of layered materials in a controlled way while measuring the related forces during sliding [136,137], atomic force microscopy (AFM) experiments performed on single-or few-layer samples of graphene and MoS2 have revealed intriguing tribological characteristics on the nanometer length-scale, including but not limited to, layer- [138], speed- [139] and directiondependence (anisotropy) [140][141][142]. AFM has also been used to investigate friction mechanisms for other TMDs, including WS2 and WSe2 [143] as well as MoSe2 and MoTe2 [144].…”

Section: Solid Lubrication With 2d Layered Materialsmentioning

confidence: 99%

Synergetic effects of surface texturing and solid lubricants to tailor friction and wear – A review

Rosenkranz

Costa

Baykara

et al. 2021

Tribology International

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337

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Surface texturing and solid lubricants have demonstrated the ability to substantially reduce friction and wear under dry conditions. In recent decades, these two technologies have been combined to leverage the advantages of both for superior tribological performance. This review article first summarizes the state-of-the-art regarding surface texturing and solid lubricants, including soft metals, polytetrafluoroethylene, diamond-like carbon and 2D layered materials. Then, the synergy between surface textures and solid lubricants is discussed, with particular emphasis on the underlying mechanisms. Finally, gaps in the existing understanding of these synergies are identified and opportunities for future research are suggested.

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“…Also, an increase in the thickness of MoS2 results in the decrease of the nanofriction, and the increase in the anisotropy ratio of nanofriction. Ackgoz and co-workers [99] studied the influence of sliding speed on the frictional behavior of single-layer and bulk MoS2 using AFM experiments. They concluded that friction forces increase logarithmically with the increase in sliding speed.…”

Section: Molybdenum Disulfide (Mos2)mentioning

confidence: 99%

Tribology of 2D Nanomaterials: A Review

Uzoma¹,

Hu²,

Khadem³

et al. 2020

Preprint

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The exfoliation of graphene has opened a new frontier in material science with a focus on 2D materials. The unique thermal, physical and chemical properties of these materials have made them one of the choicest candidates in novel mechanical and nano-electronic devices. Notably, 2D materials such as graphene, MoS2, WS2, h-BN, and Black Phosphorus have shown outstanding lowest frictional coefficients and wear rates, making them attractive materials for high-performance nano-lubricants and lubricating applications. The objective of this work is to provide a comprehensive overview of the most recent developments in the tribological potentials of 2D materials. At first, the essential physical, wear, and frictional characteristics of the 2D materials including their production techniques are discussed. Subsequently, the experimental explorations and theoretical simulations of the most common 2D materials are reviewed in regards to their tribological applications such as their use as solid lubricants and surface lubricant nano-additives. The effects of micro/nano textures on friction behavior are also reviewed. Finally, the current challenges in tribological applications of 2D materials and their prospects are discussed.

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Speed dependence of friction on single-layer and bulk MoS2 measured by atomic force microscopy

Cited by 34 publications

References 38 publications

Bifurcation of nanoscale thermolubric friction behavior for sliding on MoS2

Bifurcation of nanoscale thermolubric friction behavior for sliding on MoS2

Synergetic effects of surface texturing and solid lubricants to tailor friction and wear – A review

Tribology of 2D Nanomaterials: A Review

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