Friction and Adhesion of Different Structural Defects of Graphene

Tripathi, Manoj; Awaja, Firas; Bizão, Rafael A.; Signetti, Stefano; Iacob, Erica; Paolicelli, G; Valeri, Sergio; Dalton, Alan B.; Pugno, Nicola

doi:10.1021/acsami.8b10294

Cited by 42 publications

(33 citation statements)

References 47 publications

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“…The main reason behind this is the introduction of defects caused by the reduction process, which makes wrinkles softer. 30,59 This matches well with the observed decreased elasticity of the wrinkles, and also justifies the increase of viscosity and the adhesive force. To explain the strengthened interactions between the wrinkles, they can be identified as interactions between the GO-GO interfaces.…”

Section: / 33supporting

confidence: 87%

“…The potential of wrinkling graphene as a method to tailor multifunctional properties, such as super-hydrophobicity, capacitive, sensing, adsorbing, has been explored in several studies. [26][27][28][29] Despite of some studies on engineering wrinkle for controlling friction of graphene, 15,30,31 to the best of our knowledge, no work has so far focused on the effect of wrinkles in graphene on the damping properties of their composites and elucidated the damping mechanisms from the nanofriction perspective with the aid of atomic force microscope (AFM).…”

Section: Introductionmentioning

confidence: 99%

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Engineering Graphene Wrinkles for Large Enhancement of Interlaminar Friction Enabled Damping Capability

Qin

Wang

et al. 2019

ACS Appl. Mater. Interfaces

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Graphene nanoplates are hoped-for solid lubricants to reduce friction and energy dissipation in micro-and nano-scale devices benefiting from their interface slips to reach an expected superlubricity. On the contrary, we propose here by introducing engineered wrinkles of graphene nanoplates to exploit and optimize the interfacial energy dissipation mechanisms between the nanoplates in graphene-based composites for enhanced vibration damping performance.Polyurethane (PU) beams with designed sandwich structures have been successfully fabricated to activate the interlaminar slips of wrinkled graphene-graphene, which significantly contribute to the dissipation of vibration energy. These engineered composite materials with extremely low graphene content (~0.08wt%) yield a significant increase of quasi-static and dynamic damping compared to the baseline PU beams (by 71% and 94%, respectively). Friction force images of wrinkled graphene 2 / 33 oxide (GO) nanoplates detected via Atomic Force Microscope (AFM) indicate that wrinkles with large coefficients of friction (COFs) indeed play a dominant role in delaying slip occurrences.Reduction of GO further enhances the COFs of the interacting wrinkles by 7.8% owing to the increased effective contact area and adhesive force. This work provides a new insight on how to design graphene-based composites with optimized damping properties from the microstructure perspective.

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Section: / 33supporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Engineering Graphene Wrinkles for Large Enhancement of Interlaminar Friction Enabled Damping Capability

Qin

Wang

et al. 2019

ACS Appl. Mater. Interfaces

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“…[7][8][9] Consequently, friction on 2D materials was evaluated in a number of studies conducted primarily via atomic force microscopy (AFM), focusing on the effects of applied load, the number of layers, structural defects, and humidity, among others. [10][11][12][13][14][15][16][17] Despite the extensive amount of work performed toward elucidating friction mechanisms on 2D materials, very few results were published on the dependence of friction forces on sliding speed. 18 This is potentially a critical concern, as components in various micro-and nano-scale mechanical systems designed to be lubricated by 2D materials are expected to move in a wide range of speeds during operation.…”

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confidence: 99%

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

Acikgoz

Baykara

2020

Applied Physics Letters

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We perform atomic force microscopy (AFM) experiments on mechanically exfoliated, single-layer and bulk molybdenum disulfide (MoS 2) in order to probe friction forces as a function of sliding speed. The results of the experiments demonstrate that (i) friction forces increase logarithmically with respect to sliding speed, (ii) there is no correlation between the speed dependence of friction and the number of layers of MoS 2 , and (iii) changes in the speed dependence of friction can be attributed to changes in the physical characteristics of the AFM probe, manifesting in the form of varying contact stiffness and tip-sample interaction potential parameters in the thermally activated Prandtl-Tomlinson model. Our study contributes to the formation of a mechanistic understanding of the speed dependence of nanoscale friction on two-dimensional materials.

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“…By increasing normal force, Gr becomes more defective while the breaking strength of Gr becomes very small, which results in Gr fracture and tearing. The average threshold force for the tearing of CVD Gr considered here is around 4 µN and it is much higher, at least by an order of magnitude, than in CVD Gr grown on copper and transferred on SiO 2 , where Gr tearing was always initiated from long and wide, thermally grown wrinkles, for normal loads less than 0.5 µN [23] and sometimes already at around 100 nN [38]. Although in the former cases single-layer Gr samples were considered, the wear resistance of CVD Gr grown on Mo seems to be higher because of the different type of wrinkles in CVD Gr grown on Mo.…”

Section: Friction and Wear Propertiesmentioning

confidence: 68%

Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum

Vasić

Ralević

Zobenica

et al. 2020

Applied Surface Science

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Chemical vapour deposition (CVD) is a promising method for producing largescale graphene (Gr). Nevertheless, microscopic inhomogeneity of Gr grown on traditional metal substrates such as copper or nickel results in a spatial variation of Gr properties due to long wrinkles formed when the metal substrate shrinks during the cooling part of the production cycle. Recently, molybdenum (Mo) has emerged as an alternative substrate for CVD growth of Gr, mainly due to a better matching of the thermal expansion coefficient of the substrate and Gr. We investigate the quality of multilayer Gr grown on Mo and the relation between Gr morphology and nanoscale mechanical and electrical properties, and spatial homogeneity of these parameters. With atomic force microscopy (AFM) based scratching, Kelvin probe force microscopy, and conductive AFM, we measure friction and wear, surface potential, and local conductivity, respectively. We find that Gr grown on Mo is free of large wrinkles that are common with growth on other metals, although it contains a dense network of small wrinkles. We demonstrate that as a result of this unique and favorable morphology, the Gr studied here has low friction, high wear resistance, and excellent homogeneity * Corresponding author Email address: bvasic@ipb.ac.rs (Borislav Vasić) of electrical surface potential and conductivity. 1

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Friction and Adhesion of Different Structural Defects of Graphene

Abstract: (2018) Friction and adhesion of different structural defects of graphene. ACS Applied Materials and Interfaces, 10 (51). pp. 44614-44623.

Cited by 42 publications

References 47 publications

Engineering Graphene Wrinkles for Large Enhancement of Interlaminar Friction Enabled Damping Capability

Engineering Graphene Wrinkles for Large Enhancement of Interlaminar Friction Enabled Damping Capability

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

Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum

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