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Strain Engineering Modulates Graphene Interlayer Friction by Moiré Pattern Evolution.

Kunqi Wang, Cangyu Qu, Jin Wang

  • 1Department of Physical Chemistry, School of Chemistry , Tel Aviv University , Tel Aviv 6997801 , Israel.

ACS Applied Materials & Interfaces
|September 6, 2019
PubMed
Summary
This summary is machine-generated.

Applying strain to graphene substrates can significantly reduce sliding friction in superlubric systems. Larger graphene flakes require less strain for substantial friction reduction, driven by Moiré pattern evolution.

Keywords:
Moiré pattern evolutiongraphenenonmonotonic friction reductionsize effectstrain engineeringsuperlubricity

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Tribology

Background:

  • Superlubricity, a state of extremely low friction, is crucial for reducing wear and energy loss in mechanical systems.
  • Previous studies on two-dimensional (2D) materials showed monotonic friction reduction with strain, but the behavior in graphene systems is less understood.

Purpose of the Study:

  • To investigate the effect of strain on the sliding friction of a graphene flake on strained graphene substrates.
  • To elucidate the underlying mechanisms responsible for friction modification in this superlubric system.
  • To explore the role of flake size and Moiré patterns in strain-engineered friction reduction.

Main Methods:

  • Molecular dynamics simulations were employed to model the sliding friction between a graphene flake and a strained graphene substrate.
  • System parameters, including flake size and applied biaxial strain, were systematically varied.

Main Results:

  • Friction reduction in this superlubric system is nonmonotonic with applied strain, a deviation from findings in other 2D materials.
  • A critical strain threshold for significant friction reduction decreases substantially as the graphene flake size increases.
  • For a 250 nm flake, a mere 0.1% biaxial strain induced a >100-fold friction reduction.

Conclusions:

  • The evolution and relative area of Moiré patterns are identified as the primary mechanism governing friction in strain-engineered superlubricity.
  • Strain engineering is a highly efficient strategy for friction modification, particularly effective for larger contact areas in superlubric systems.