Interlayer Friction and Superlubricity in Single-Crystalline Contact Enabled by Two-Dimensional Flake-Wrapped Atomic Force Microscope Tips

Liu, Yanmin; Song, Aisheng; Li, Zhiheng; Zong, Ruilong; Zhang, Jie; Yang, Wenyan; Wang, Rong; Hu, Yuanzhong; Luo, Jianbin; Ma, Tianbao

doi:10.1021/acsnano.7b09083

Cited by 135 publications

(97 citation statements)

References 47 publications

(64 reference statements)

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“…Graphene is an excellent lubricating coating layer because of its extremely high intrinsic strength, ultralow binding strength with many surfaces, e.g., graphite, hexagonal boron nitride (hBN), MoS 2, and atomically smooth surface . For example, the friction between graphene/graphene, graphene/MoS 2 , graphene/hBN, and graphene/diamond‐like‐carbon (DLC) measured at either nanoscale or microscale could be so small that such layered‐material junctions could reach superlubricity, a state in which the lateral interactions between two incommensurate surfaces are effectively canceled resulting in ultralow sliding friction. The ultralow friction state could also be achieved for tip with radius from 20 to 1000 nm sliding on graphene supported by substrates, e.g., diamond tip with graphene on SiO 2 substrate, Si tip with graphene on SiO 2 substrate, and diamond tip with graphene on Cu substrate and the lubrication properties was robust under different normal load …”

Section: Introductionmentioning

confidence: 99%

The Impacts of Adhesion on the Wear Property of Graphene

Zhao

Zhang

et al. 2019

Adv Materials Inter

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a state in which the lateral interactions between two incommensurate surfaces are effectively canceled resulting in ultralow sliding friction. The ultralow friction state could also be achieved for tip with radius from 20 to 1000 nm sliding on graphene supported by substrates, e.g., diamond tip with graphene on SiO 2 substrate, [11,12] Si tip with graphene on SiO 2 substrate, [13] and diamond tip with graphene on Cu substrate [14] and the lubrication properties was robust under different normal load. [15] The ultralow friction and high intrinsic strength make graphene an ideal candidate for antiwear coating materials. On the nano and microlevel, Shin et al. [11] carried out microscale scratch tests on exfoliated and epitaxial graphene on a silica substrate. When the indenter was pressed into the monolayer graphene sample at a depth of more than 150 times of its thickness, no damage occurred within the graphene. Using atomic force microscope (AFM) tip with a radius about 100 nm sliding on graphene that mechanically exfoliated to SiO 2 substrates, Qi et al. [12] reported that the monolayer graphene still maintained a low friction coefficient of 0.01 for a prolonged period (4096 cycles) with a normal load up to 9150 nN, and the interior region of graphene shows better wear resistance. Qi et al. [16] further found that the wear resistance of the free edge of graphene could be improved by performing air plasma treatment. With a similar setup, Vasic et al. [17] showed that the SiO 2 substrate gets plastically deformed for lower normal loads, followed by a sudden Adhesion plays an important role in the antiwear property of graphene layer on a substrate. Here the wear property of the inner region of monolayer graphene grown on copper foils via chemical vapor deposition is studied. The adhesive strength is controlled by changing the oxidation of the copper substrate into two oxidation degrees with intact graphene preserved. For graphene layers on copper substrates with either low oxidation degree (LOD) or high oxidation degree (HOD), it is found in both systems wear starts at the wrinkle position under similar normal force. However, with the development of wear, for the LOD substrate the covering graphene layer is worn out gradually, while for the HOD substrate the graphene layer is peeled off rapidly. By measuring the adhesion between graphene and substrates indirectly, together with finite element analysis, it is shown that the underlying mechanism for the different wear phenomena is due to the higher adhesion between graphene and LOD substrates than that between graphene and HOD substrates. This study provides insights on the impacts of adhesion between monolayer material and substrates on the antiwear properties, which can benefit the design of lubrication coatings based on layered materials. Wear

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Section: Introductionmentioning

confidence: 99%

The Impacts of Adhesion on the Wear Property of Graphene

Zhao

Zhang

et al. 2019

Adv Materials Inter

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“…To measure the intrinsic interlayer frictional properties between the atomic planes of 2D materials, Liu et al coated AFM tips with graphene sheets via thermally assisted mechanical exfoliation and transfer as shown in Figure a. By sliding such coated tips on top of different 2D materials (MoS 2 , ReS 2 , hBN, TaS 2 , and graphene), their friction coefficients are measured to be all within the superlubric regime (Figure b) . Such graphite‐coated AFM tip which can be fabricated in different ways could not only be used to measure the friction between single crystalline surfaces on nanoscale but also the van der Waals interactions …”

Section: Structural Superlubricity In Heterojunctionsmentioning

confidence: 99%

Section: Structural Superlubricity In Heterojunctionsmentioning

confidence: 99%

“…The crystalline materials discussed include but not limited to 2D materials. Generally, structural superlubric contacts can be divided into homogeneous (graphite/graphite, MoS 2 /MoS 2 , carbon nanotube/carbon nanotube) and heterogeneous (W/Si, Sb/graphite, Sb/MoS 2 , gold/graphite, graphite/MoS 2 , graphite/hexagonal boron nitride) contacts ( Figure ). This kind of friction reduction scheme is one of the most interesting concepts in modern tribology .…”

Section: Introductionmentioning

confidence: 99%

“…Copyright 2016, AAAS; 2017 Reproduced with permission . Copyright 2017, Macmillan Publishers Ltd; 2018 Reproduced with permission . Copyright 2018, American Chemical Society; 2017 Reproduced with permission .…”

Section: Introductionmentioning

confidence: 99%

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Structural Superlubricity Based on Crystalline Materials

Song

et al. 2019

Small

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.201903018.Herein, structural superlubricity, a fascinating phenomenon where the friction is ultralow due to the lateral interaction cancellation resulted from incommensurate contact crystalline surfaces, is reviewed. Various kinds of nano-and microscale materials such as 2D materials, metals, and compounds are used for the fabrication. For homogeneous frictional pairs, superlow friction forces exist in most relative orientations with incommensurate configuration. Heterojunctions bear no resemblance to homogeneous contact, since the lattice constants are naturally mismatched which leads to a robust structural superlubricity with any orientation of the two different surfaces. A discussion on the perspectives of this field is also provided to meet the existing challenges and chart the future. www.advancedsciencenews.com

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Friction Characteristics of Molybdenum Disulfide Thin Films Synthesized via Plasma Sulfurization

et al. 2021

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Herein, the tribological behavior of layered few nanometer‐thick MoS2 thin films is evaluated to identify their applicability to an oil‐free solid‐lubrication coating layer. The MoS2 thin films are synthesized using a plasma sulfurization process with optimized steps and conditions derived from a previous study. MoS2 thin films with different thicknesses are heat treated at 400 °C to investigate the effect on their tribological properties. The ball‐on‐disk method is used to observe the friction and wear behavior of the MoS2 thin films, and this test is carried out under an applied load of 0.5 N in an ambient atmosphere (≈23 °C). The coefficient of friction of the unheated MoS2 layers increases rapidly at 32–36 cycles regardless of the thickness. However, the heat‐treated MoS2 films maintain a lower coefficient of friction for more cycles (60–86 cycles). The heat treatment effect effectively increases the wear life of the MoS2 thin film. Based on this result, it is believed that the heat‐treated MoS2 thin films can be potential solid lubricant candidate for micro‐ and nanoelectromechanical systems.

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Interlayer Friction and Superlubricity in Single-Crystalline Contact Enabled by Two-Dimensional Flake-Wrapped Atomic Force Microscope Tips

Cited by 135 publications

References 47 publications

The Impacts of Adhesion on the Wear Property of Graphene

The Impacts of Adhesion on the Wear Property of Graphene

Structural Superlubricity Based on Crystalline Materials

Friction Characteristics of Molybdenum Disulfide Thin Films Synthesized via Plasma Sulfurization

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