Superlubricity of Graphite

Dienwiebel, Martin; Verhoeven, Gertjan S.; Pradeep, Namboodiri; Frenken, J.W.M.; Heimberg, J. A.; Zandbergen, H.W.

doi:10.1103/physrevlett.92.126101

Cited by 1,283 publications

(1,049 citation statements)

References 23 publications

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“…Superlow friction would subsequently be achieved because of the extremely weak interaction and easily sliding between the transferred GNFs and graphite in the incommensurate contact 6, 7, 10, 19. According to the previous studies on the superlubricity of graphite, the superlow friction would disappear at two certain sliding orientations with an angle difference of 60° under small loads 6, 7. However, we did not observe this sliding orientation dependency of the superlubricity under the high contact pressure.…”

Section: Resultscontrasting

confidence: 62%

“…In this case, the GNFs may form the incommensurate sliding with the original graphite substrate because of their similar lattices. Superlow friction would subsequently be achieved because of the extremely weak interaction and easily sliding between the transferred GNFs and graphite in the incommensurate contact 6, 7, 10, 19. According to the previous studies on the superlubricity of graphite, the superlow friction would disappear at two certain sliding orientations with an angle difference of 60° under small loads 6, 7.…”

Section: Resultsmentioning

confidence: 97%

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Superlubricity of Graphite Sliding against Graphene Nanoflake under Ultrahigh Contact Pressure

Luo

2018

Advanced Science

105

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Superlubricity of graphite sliding against graphene can be easily attained at the nanoscale when it forms the incommensurate contact under a low contact pressure. However, the achievement of superlubricity under an ultrahigh contact pressure (>1 GPa), which has more applications in the lubrication of micromachine and nanomachine, remains unclear. Here, this problem is addressed and the robust superlubricity of graphite is obtained under ultrahigh contact pressures of up to 2.52 GPa, by the formation of transferred graphene nanoflakes on a silicon tip. The friction coefficient becomes as low as 0.0003, a state that is attributed to the extremely low shear strength of the graphene/graphite interface in the incommensurate contact. When the pressure exceeds some threshold, the superlubricity state collapses suddenly with the friction coefficient increasing ≈10 times. The failure of superlubricity originates from the delamination of the topmost graphene layers on graphite under ultrahigh contact pressures, which requires the tip to provide additional exfoliation energies during the sliding process. The results demonstrate that the superlubricity of graphite sliding against graphene can exist stably under ultrahigh contact pressure, which would appear to accelerate its application in nanoscale lubrication.

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Section: Resultscontrasting

confidence: 62%

Section: Resultsmentioning

confidence: 97%

Superlubricity of Graphite Sliding against Graphene Nanoflake under Ultrahigh Contact Pressure

Luo

2018

Advanced Science

105

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“…This would amount to the slider "ironing" the kinks onward. Dienwiebel et al [3] demonstrated how incommensurability may lead to virtually friction-free sliding in such a case, but no measure was obtained for the flake relative sliding velocity. Real substrates are, unlike our model, not rigid, subject to thermal expansion, etc.…”

Section: Discussionmentioning

confidence: 99%

Kink plateau dynamics in finite-size lubricant chains

et al. 2007

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We extend the study of velocity quantization phenomena recently found in the classical motion of an idealized 1D model solid lubricant -consisting of a harmonic chain interposed between two periodic sliding potentials [Phys. Rev. Lett. 97, 056101 (2006)]. This quantization is due to one slider rigidly dragging the commensurate lattice of kinks that the chain forms with the other slider. In this follow-up work we consider finite-size chains rather than infinite chains. The finite size (i) permits the development of robust velocity plateaus as a function of the lubricant stiffness, and (ii) allows an overall chain-length re-adjustment which spontaneously promotes single-particle periodic oscillations. These periodic oscillations replace the quasiperiodic motion produced by general incommensurate periods of the sliders and the lubricant in the infinite-size model. Possible consequences of these results for some real systems are discussed.

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“…6 Super-diffusivity has been observed in systems involving graphitic compounds: fullerenes, 7,8 metallic clusters 9 or graphene flakes adsorbed on graphite. 10,11 The existence of quadrupole or higher order interactions may cause the super-diffusivity between graphene and graphite observed with atomic force microscopy (AFM). 10,12,13 Interactions of the same nature exist in poly-aromatic hydrocarbons (PAH) adsorbed on graphitic substrates, 14,15 which are characterized by a very low energy barrier for lateral diffusion 16 and can act as nano-sized lubricants.…”

mentioning

confidence: 99%