Impacts of environments on nanoscale wear behavior of graphene: Edge passivation vs. substrate pinning

Qi, Y.; Liu, Jun; Dong, Yalin; Feng, Xi‐Qiao; Li, Qunyang

doi:10.1016/j.carbon.2018.06.029

Cited by 69 publications

(55 citation statements)

References 63 publications

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“…It can be found that, on the graphene basal plane, the trace and retrace lateral signals almost overlap with each other. This implies that the friction between the AFM tip and the graphene basal plane is very small, which agrees with previous results [37].…”

Section: (A))supporting

confidence: 93%

Measuring nanoscale friction at graphene step edges

Chen

Kim

2019

Friction

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Although graphene is well known for super-lubricity on its basal plane, friction at its step edge is not well understood and contradictory friction behaviors have been reported. In this study, friction of mono-layer thick graphene step edges was studied using atomic force microscopy (AFM) with a Si tip in dry nitrogen atmosphere. It is found that, when the tip slides over a 'buried' graphene step edge, there is a resistive force during the step-up motion and an assistive force during the step-down motion due to the topographic height change. The magnitude of these two forces is small and the same in both step-up and step-down motions. As for the 'exposed' graphene step edge, friction increases in magnitude and exhibits more complicated behaviors. During the step-down motion of the tip over the exposed step edge, both resistive and assistive components can be detected in the lateral force signal of AFM if the scan resolution is sufficiently high. The resistive component is attributed to chemical interactions between the functional groups at the tip and step-edge surfaces, and the assistive component is due to the topographic effect, same as the case of buried step edge. If a blunt tip is used, the distinct effects of these two components become more prominent. In the step-up scan direction, the blunt tip appears to have two separate topographic effects-elastic deformation of the contact region at the bottom of the tip due to the substrate height change at the step edge and tilting of the tip while the vertical position of the cantilever (the end of the tip) ascends from the lower terrace to the upper terrace. The high-resolution measurement of friction behaviors at graphene step edges will further enrich understanding of interfacial friction behaviors on graphene-covered surfaces.

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Section: (A))supporting

confidence: 93%

Measuring nanoscale friction at graphene step edges

Chen

Kim

2019

Friction

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“…edge is found dependent on humidity, as the dangling bonds at the step edge could be passivated by water molecules (Fig. 32(c)) [696]. The grain boundaries (GBs) on graphene are also responsible for the deterioration of wear resistance, as Zhang et al have proposed [697].…”

Section: Simulationmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

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“…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 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 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 showed that the SiO 2 substrate gets plastically deformed for lower normal loads, followed by a sudden tearing of graphene for high enough normal load, with subsequent graphene peeling off from the substrate.…”

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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Impacts of environments on nanoscale wear behavior of graphene: Edge passivation vs. substrate pinning

Cited by 69 publications

References 63 publications

Measuring nanoscale friction at graphene step edges

Measuring nanoscale friction at graphene step edges

A review of recent advances in tribology

The Impacts of Adhesion on the Wear Property of Graphene

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