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Superlubric polycrystalline graphene interfaces

Author

Listed:
  • Xiang Gao

    (Tel Aviv University)

  • Wengen Ouyang

    (Wuhan University)

  • Michael Urbakh

    (Tel Aviv University)

  • Oded Hod

    (Tel Aviv University)

Abstract

The effects of corrugated grain boundaries on the frictional properties of extended planar graphitic contacts incorporating a polycrystalline surface are investigated via molecular dynamics simulations. The kinetic friction is found to be dominated by shear induced buckling and unbuckling of corrugated grain boundary dislocations, leading to a nonmonotonic behavior of the friction with normal load and temperature. The underlying mechanism involves two effects, where an increase of dislocation buckling probability competes with a decrease of the dissipated energy per buckling event. These effects are well captured by a phenomenological two-state model, that allows for characterizing the tribological properties of any large-scale polycrystalline layered interface, while circumventing the need for demanding atomistic simulations. The resulting negative differential friction coefficients obtained in the high-load regime can reduce the expected linear scaling of grain-boundary friction with surface area and restore structural superlubricity at increasing length-scales.

Suggested Citation

  • Xiang Gao & Wengen Ouyang & Michael Urbakh & Oded Hod, 2021. "Superlubric polycrystalline graphene interfaces," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25750-w
    DOI: 10.1038/s41467-021-25750-w
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    Cited by:

    1. Yiming Song & Xiang Gao & Rémy Pawlak & Shuyu Huang & Antoine Hinaut & Thilo Glatzel & Oded Hod & Michael Urbakh & Ernst Meyer, 2024. "Non-Amontons frictional behaviors of grain boundaries at layered material interfaces," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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