Microscale study of frictional properties of graphene in ultra high vacuum

Marchetto, Diego; Feser, Tim; Dienwiebel, Martin

doi:10.1007/s40544-015-0080-8

Cited by 42 publications

(27 citation statements)

References 25 publications

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“…As illustrated in Figure a–d, three domains (SLG, BLG, and Cu) showing different friction responses in each panel can be clearly distinguished. Friction forces of both SLG and BLG domains are much smaller than that of bare copper substrate since an ideal graphene film is atomically smooth and has no dangling bond, resulting in low shear strength . Friction force of SLG is larger than that of BLG, which is consistent with previous literature .…”

Section: Resultssupporting

confidence: 90%

Understanding Interlayer Contact Conductance in Twisted Bilayer Graphene

Song

Sun

et al. 2019

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Bilayer or few‐layer 2D materials showing novel electrical properties in electronic device applications have aroused increasing interest in recent years. Obtaining a comprehensive understanding of interlayer contact conductance still remains a challenge, but is significant for improving the performance of bilayer or few‐layer 2D electronic devices. Here, conductive atomic force microscope (C‐AFM) experiments are reported to explore the interlayer contact conductance between bilayer graphene (BLG) with various twisted stacking structures fabricated by the chemical vapor deposition (CVD) method. The current maps show that the interlayer contact conductance between BLG strongly depends on the twist angle. The interlayer contact conductance of 0° AB‐stacking bilayer graphene (AB‐BLG) is ≈4 times as large as that of 30° twisted bilayer graphene (t‐BLG), which indicates that the twist angle–dependent interlayer contact conductance originates from the coupling–decoupling transitions. Moreover, the moiré superlattice‐level current images of t‐BLG show modulations of local interlayer contact conductance. Density functional theory calculations together with a theoretical model reproduce the C‐AFM current map and show that the modulation is mainly attributed to the overall contribution of local interfacial carrier density and tunneling barrier.

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Section: Resultssupporting

confidence: 90%

Understanding Interlayer Contact Conductance in Twisted Bilayer Graphene

Song

Sun

et al. 2019

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“…[1,2] It can be used as solid, atomic-thick coating or as colloidal liquid lubricant. Its high strength, chemical stability and easy shear capability make it very appealing for a wide range of tribological applications, as revealed by the increasing number of experimental [3][4][5][6][7][8][9][10][11][12][13][14][15] and theoretical studies[16-28] on graphene friction. Recent experimental findings, in particular, revealed that graphene posses a great potential as solid lubricant not only for nano-scale, but also for macro-scale applications.…”

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confidence: 99%

Tribochemistry of graphene on iron and its possible role in lubrication of steel

Restuccia

Righi

2016

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115

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Recent tribological experiments revealed that graphene is able to lubricate macroscale steelon-steel sliding contacts very effectively both in dry and humid conditions. This effect has been attributed to a mechanical action of graphene related to its load-carrying capacity.Here we provide further insight into the functionality of graphene as lubricant by analysing its tribochemical action. By means of first principles calculations we show that graphene binds strongly to native iron surfaces highly reducing their surface energy. Thanks to a passivating effect, the metal surfaces coated by graphene become almost inert and present very low adhesion and shear strength when mated in a sliding contact. We generalize the result by establishing a connection between the tribological and the electronic properties of interfaces, which is relevant to understand the fundamental nature of frictional forces.

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“…Despite great advances in science and technology and remarkable research progress on friction, the current understanding of friction and lubrication phenomena is macroscopic. Owing to the development of micromechanical devices, macroscopic tribology theory has become obsolete, and the characteristics of friction at the microscale have been extensively investigated [25,26]. Tribology has also followed this developmental trend and has gradually evolved into nanotribology.…”

Section: Nanoscale Friction Mechanism Of 2d Materialsmentioning

confidence: 99%

Recent advances in friction and lubrication of graphene and other 2D materials: Mechanisms and applications

et al. 2019

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Two-dimensional materials having a layered structure comprise a monolayer or multilayers of atomic thickness and ultra-low shear strength. Their high specific surface area, in-plane strength, weak layer-layer interaction, and surface chemical stability result in remarkably low friction and wear-resisting properties. Thus, 2D materials have attracted considerable attention. In recent years, great advances have been made in the scientific research and industrial applications of anti-friction, anti-wear, and lubrication of 2D materials. In this article, the basic nanoscale friction mechanisms of 2D materials including interfacial friction and surface friction mechanisms are summarized. This paper also includes a review of reports on lubrication mechanisms based on the film-formation, self-healing, and ball bearing mechanisms and applications based on lubricant additives, nanoscale lubricating films, and space lubrication materials of 2D materials in detail. Finally, the challenges and potential applications of 2D materials in the field of lubrication were also presented.

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Microscale study of frictional properties of graphene in ultra high vacuum

Cited by 42 publications

References 25 publications

Understanding Interlayer Contact Conductance in Twisted Bilayer Graphene

Understanding Interlayer Contact Conductance in Twisted Bilayer Graphene

Tribochemistry of graphene on iron and its possible role in lubrication of steel

Recent advances in friction and lubrication of graphene and other 2D materials: Mechanisms and applications

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