Nanoscale Friction of Graphene

Ptak, F.; Almeida, C. M.; Prioli, R.

doi:10.1557/adv.2018.519

Cited by 5 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been shown that temperature indeed plays a significant role in the tribological behavior of graphene, as the temperature increases so does the surface roughness and the graphene sheet deformation 42 . As for the second condition, a consequence could be a correlation between adhesion and the measured friction, however previous results do not reinforce this idea 43,44 .…”

Section: Discussionmentioning

confidence: 77%

Velocity-dependent friction enhances tribomechanical differences between monolayer and multilayer graphene

Ptak

Almeida

Prioli

2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

The influence of sliding speed in the nanoscale friction forces between a silicon tip and monolayer and multilayer graphene were investigated with the use of an atomic force microscope. We found that the friction forces increase linearly with the logarithm of the sliding speed in a highly layer-dependent way. The increase in friction forces with velocity is amplified at the monolayer. The amplification of the friction forces with velocity results from the introduction of additional corrugation in the interaction potential driven by the tip movement. This effect can be interpreted as a manifestation of local thermally induced surface corrugations in nanoscale influencing the hopping dynamics of the atoms at the contact. These experimental observations were explained by modeling the friction forces with the thermally activated Prandtl-Tomlinson model. The model allowed determination of the interaction potential between tip and graphene, critical forces, and attempt frequencies of slip events. The latter was observed to be dominated by the effective contact stiffness and independent of the number of layers.

show abstract

Section: Discussionmentioning

confidence: 77%

Velocity-dependent friction enhances tribomechanical differences between monolayer and multilayer graphene

Ptak

Almeida

Prioli

2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the recent past, graphene has attracted considerable attention as a potential ultrathin material for surface protection, i.e., it modifies the friction, wear, and corrosion. , Nanoscale tribological studies have shown the thickness dependence of friction in graphene, viz., the coefficient of friction (COF) decreases with increasing number of graphene layers from 1 to 4. , The nanoscale friction and wear behaviors of graphene-coated diverse surfaces, measured using atomic/friction force microscopy (AFM/FFM), – have also been studied where graphene contributed to the reduction of friction and wear. In general, in graphene’s tribology, the main focus is on its nanoscale tribology so far.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Control of Sliding Contact and Oxidation via Graphene-Based Materials

Bharti,

Sunkara,

Vishwakarma

et al. 2023

ACS Appl. Eng. Mater.

View full text Add to dashboard Cite

Friction and wear, which originate as a consequence of contact sliding, remain critical concerns. In many systems, friction causes 20−30% wastage of energy, while wear leads to premature failure of systems. Oxidation/corrosion is another major concern that limits the functionality and durability of components. Here, employing experiments and atomistic simulations, we demonstrate that single-layer graphene (SLG) adequately reduces the friction and wear of a metal and provides excellent oxidation protection. But beyond certain initial contact cycles, its coefficient of friction (COF) continuously increases from ∼0.15 with progressing sliding cycles. In contrast, multilayer graphene (MGR) always maintains low friction (COF ≤ 0.1) and achieves relatively better wear resistance. Nevertheless, atomic thickness and realized good tribological and oxidation protection properties still make SLG a crucial candidate for many systems with constraint overcoat thickness such as magnetic storage devices and micro-/ nano-electromechanical systems. The tribological properties of SLG and MGR are also compared with solution-based graphite coatings and plasma-grown diamond-like carbon coating. Through spectroscopic and microscopic characterizations, along with atomistic simulations and hypothetical models, we discover and present the friction and wear mechanisms of these tribo-systems. This work uncovers the critical sliding behavior of carbon-based systems for advancing and enabling sustainable moving mechanical technologies.

show abstract

“…Although such analysis is widely employed in friction and adhesion studies, ,, other studies have reported that friction and adhesion exhibit opposite trends. − Therefore, fundamental questions remain about how closely interfacial adhesion can be correlated to friction. Experimentally, adhesion is determined by measuring the force needed to separate contacting bodies while applying a tensile stress to the contact along the direction normal to the interface.…”

mentioning

confidence: 99%

Effect of Atomic Corrugation on Adhesion and Friction: A Model Study with Graphene Step Edges

Chen

Vazirisereshk

Khajeh

et al. 2019

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

This letter reports that the atomic corrugation of the surface can affect nanoscale interfacial adhesion and friction differently. Both atomic force microscopy (AFM) and molecular dynamics (MD) simulations showed that the adhesion force needed to separate a silica tip from a graphene step edge increases as the side wall of the tip approaches the step edge when the tip is on the lower terrace, and decreases as the tip is ascending or descending the step edge. However, the friction force measured with the same AFM tip moving across the step edge does not positively correlate with the measured adhesion, which implies that the conventional contact mechanics approach of correlating interfacial adhesion and friction could be invalid for surfaces with atomic-scale features. The chemical and physical origins for the observed discrepancy between adhesion and friction at the atomic step edge are discussed.

show abstract

Nanoscale Friction of Graphene

Cited by 5 publications

References 21 publications

Velocity-dependent friction enhances tribomechanical differences between monolayer and multilayer graphene

Velocity-dependent friction enhances tribomechanical differences between monolayer and multilayer graphene

Simultaneous Control of Sliding Contact and Oxidation via Graphene-Based Materials

Effect of Atomic Corrugation on Adhesion and Friction: A Model Study with Graphene Step Edges

Contact Info

Product

Resources

About