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Modeling nanoribbon peeling.

L Gigli1, A Vanossi2, E Tosatti3

  • 1International School for Advanced Studies (SISSA), Via Bonomea 265, 34136 Trieste, Italy. tosatti@sissa.it.

Nanoscale
|September 19, 2019
PubMed
Summary
This summary is machine-generated.

Researchers modeled graphene nanoribbon peeling from surfaces. They identified a universal two-stage transition during mechanical peeling, crucial for nanoscience applications.

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Area of Science:

  • Nanoscience and Materials Science
  • Mechanical Engineering
  • Surface Science

Background:

  • Physisorbed 2D material ribbons, like graphene, are routinely lifted and exfoliated in nanoscience.
  • The structural lubricity of stiff 2D material contacts presents unique challenges in these processes.

Purpose of the Study:

  • To theoretically model the mechanical peeling of a graphene nanoribbon from a flat crystal surface using tip-forced lifting.
  • To analyze the evolution of shape, energy, local curvature, and advancement during peeling.
  • To identify universal transitions and their determinants in the peeling process.

Main Methods:

  • Theoretical modeling of nanoribbon peeling dynamics.
  • Analysis of distinct peeling regimes: prying, stripping, sliding, and liftoff.
  • Investigating the influence of substrate surface corrugation on peeling transitions.

Main Results:

  • A theoretical model predicts four peeling regimes: prying, stripping, sliding, and liftoff.
  • For negligible substrate corrugation, regime (B) disappears, leading to a universal, sharp transition from prying to sliding.
  • This transition is governed by the interplay between bending rigidity and adsorption energy.
  • The predicted two-stage peeling transition was observed in experimental data of graphene nanoribbons on Au(111).

Conclusions:

  • The study reveals a fundamental two-stage peeling mechanism for graphene nanoribbons.
  • This mechanism, characterized by a sharp transition, is critical for understanding 2D material manipulation.
  • The findings have implications for controlled exfoliation and fabrication in nanoscience and nanotechnology.