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Kunqi Wang1, Wengen Ouyang2, Wei Cao1

  • 1State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China. maming16@mail.tsinghua.edu.cn and Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China. zhengqs@tsinghua.edu.cn.

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Summary
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Strain engineering can achieve robust superlubricity in graphene by overcoming friction anisotropy. Applying biaxial or uniaxial stretching to the graphene substrate creates a Moiré pattern, enabling near-frictionless sliding.

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Area of Science:

  • Materials Science
  • Tribology
  • Condensed Matter Physics

Background:

  • Structural superlubricity, a state of near-zero friction between solid surfaces, is highly desirable but limited by friction anisotropy.
  • Achieving consistent low friction across different contact orientations remains a significant challenge for practical applications.

Purpose of the Study:

  • To investigate the effect of substrate strain on interlayer friction in graphene systems.
  • To explore methods for achieving robust, orientation-independent superlubricity in graphene.

Main Methods:

  • Molecular dynamics simulations were employed to model the friction between a graphene flake and a strained graphene substrate.
  • Both uniaxial and biaxial stretching were applied to the substrate to analyze their impact on friction coefficients.

Main Results:

  • Biaxial stretching was found to be more effective than uniaxial stretching in reducing interlayer friction.
  • Robust superlubricity, independent of relative orientation, was achieved above a critical strain threshold via both stretching methods.
  • The formation of Moiré patterns due to lattice mismatch was identified as the underlying mechanism for orientation-independent friction.

Conclusions:

  • Strain engineering offers a viable pathway to realize robust structural superlubricity in graphene.
  • Controlling Moiré pattern formation through substrate strain can overcome the anisotropy limitations of superlubricity.