Nanoscale wear of graphene and wear protection by graphene

Vasić, Borislav; Matković, Aleksandar; Ralević, Uroš; Belić, Milivoj R.; Gajić, Radoš

doi:10.1016/j.carbon.2017.05.036

Cited by 71 publications

(38 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been proposed that multilayer graphene provides better tribological characteristics than single-layer graphene. 19 However, the mechanism for this enhancement has not yet been clearly explained. To elucidate this mechanism, we investigate the interfacial strength and surface damage characteristics of multilayer h-BN, MoS 2 , and graphene.…”

Section: Resultsmentioning

confidence: 99%

Interfacial Strength and Surface Damage Characteristics of Atomically Thin h-BN, MoS₂, and Graphene

Khac

DelRio

Chung

2018

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Surface damage characteristics of single- and multilayer hexagonal boron nitride (h-BN), molybdenum disulfide (MoS), and graphene films were systematically investigated via atomic force microscopy (AFM)-based progressive-force and constant-force scratch tests and Raman spectroscopy. The film-to-substrate interfacial strengths of these atomically thin films were assessed based on their critical forces (i.e., the normal force where the atomically thin film was delaminated from the underlying substrate), as determined from progressive-force scratch tests. The evolution of surface damage with respect to normal force was further investigated using constant-force tests. The results showed that single-layer h-BN, MoS, and graphene strongly adhere to the SiO substrate, which significantly improves its tribological performance. Moreover, defect formation induced by scratch testing was found to affect the topography and friction force differently prior to failure, which points to distinct surface damage characteristics. Interestingly, the residual strains at scratched areas suggest that the scratch test-induced in-plane compressive strains were dominant over tensile strains, thereby leading to buckling in front of the scratching tip and eventually failure at sufficient strains. These trends represent the general failure mechanisms of atomically thin materials because of a scratch test. As the number of layers increased, the tribological performances of atomically thin h-BN, MoS, and graphene were found to significantly improve because of an increase in the interfacial strengths and a decrease in the surface damage and friction force. In all, the findings on the distinctive surface damage characteristics and general failure mechanisms are useful for the design of reliable, protective and solid-lubricant coating layers based on these materials for nanoscale devices.

show abstract

Section: Resultsmentioning

confidence: 99%

Interfacial Strength and Surface Damage Characteristics of Atomically Thin h-BN, MoS₂, and Graphene

Khac

DelRio

Chung

2018

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Due to its 2D nature graphene exhibit a unique combination of characteristics not seen in other carbon allotropes. Graphene is the thinnest, strongest and stiffest material [37]. Graphene has extraordinary electrical properties due to the high electron mobility at room temperature [38].…”

Section: Graphene and Graphene Oxidementioning

confidence: 99%

Graphene Nanocomposites Studied by Raman Spectroscopy

Bîru¹,

Iovu²

2018

Raman Spectroscopy

View full text Add to dashboard Cite

The goal of this chapter is to provide a general introduction about graphene nanocomposites studied by Raman spectroscopy. The chapter will therefore begin with a brief description of the major Raman bands of carbon allotropes. In the following chapter a concise comparison between single walled carbon nanotubes (SWCNTs), multi-walled carbon nanotubes (MWCNTs), fullerenes and graphene is exposed. The characteristic features in Raman spectra of carbon allotropes, namely the intense signals D and G are investigated. In particular, the chapter will outline the Raman spectrum of graphene and different types of graphene oxide. The last part of the chapter is devoted to graphene nanocomposites.

show abstract

“…Concerning chemical stability, the presence of a network of conjugated double bonds provides a large electron donoracceptor capacity with the ability to easily react with free radicals [12]. Finally, the twodimensional structure of graphene points to its potential use as a high-performance solid lubricant, an additive in liquid lubricants [13] and a sliding coating layer [14].…”

Section: Introductionmentioning

confidence: 99%

Tribological and mechanical properties of graphene nanoplatelet/PEEK composites

Puértolas

Castro

Morris

et al. 2019

Carbon

163

View full text Add to dashboard Cite

Poly(ether ether ketone) (PEEK) is a relevant thermoplastic in industry and in the biomedical sector. In this work, the lubricant capability of graphene nanoplatelets (GNPs) is used for improving the PEEK wear properties. Nanocomposites were prepared by solvent-free meltblending and injection molding at various compositions between 1 and 10 wt. % of GNPs. The Raman G band shows a progressive increment proportional to the bulk GNP percentage. From calorimetric data, the polymer matrix structure is interpreted in terms of a 3-phase model, in which the crystalline phase fluctuates from 39 to 34% upon GNP addition. Thermal conductivity varies in accordance with the polymer crystallinity. Tensile and flexural tests show a progressive increase in the modulus, as well as a decrease in the fracture strength and the work of fracture. Most important, the composite surface undergoes a substantial improvement in hardness (60%), together with a decrease in the coefficient of friction (-38%) and a great reduction in the wear factor (-83%). Abrasion and fatigue wear mechanisms are predominant at the lowest and highest GNP concentrations respectively. In conclusion, GNPs are used without any chemical functionalization as the filler in PEEK-based materials, improving the surface hardness and the tribological properties.

show abstract

Nanoscale wear of graphene and wear protection by graphene

Cited by 71 publications

References 59 publications

Interfacial Strength and Surface Damage Characteristics of Atomically Thin h-BN, MoS₂, and Graphene

Interfacial Strength and Surface Damage Characteristics of Atomically Thin h-BN, MoS₂, and Graphene

Graphene Nanocomposites Studied by Raman Spectroscopy

Tribological and mechanical properties of graphene nanoplatelet/PEEK composites

Contact Info

Product

Resources

About

Nanoscale wear of graphene and wear protection by graphene

Cited by 71 publications

References 59 publications

Interfacial Strength and Surface Damage Characteristics of Atomically Thin h-BN, MoS2, and Graphene

Interfacial Strength and Surface Damage Characteristics of Atomically Thin h-BN, MoS2, and Graphene

Graphene Nanocomposites Studied by Raman Spectroscopy

Tribological and mechanical properties of graphene nanoplatelet/PEEK composites

Contact Info

Product

Resources

About

Interfacial Strength and Surface Damage Characteristics of Atomically Thin h-BN, MoS₂, and Graphene

Interfacial Strength and Surface Damage Characteristics of Atomically Thin h-BN, MoS₂, and Graphene