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Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials
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Crystallographic orientation errors in mechanical exfoliation.

Y Kolumbus1, A Zalic1, N Fardian-Melamed2

  • 1Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, 9190401 Israel.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 7, 2018
PubMed
Summary
This summary is machine-generated.

Mechanical exfoliation of van der Waals materials like graphite introduces rotational errors in flake orientation. Electron back-scatter diffraction (EBSD) reveals true crystallographic orientations, crucial for precise material applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Crystallography

Background:

  • Van der Waals materials are crucial for advanced electronics.
  • Mechanical exfoliation is a primary method for obtaining high-quality 2D material flakes.
  • Controlling flake orientation is vital for device performance.

Purpose of the Study:

  • To quantify the effect of mechanical exfoliation on the crystallographic orientation of van der Waals material flakes.
  • To compare the accuracy of facet orientation versus electron back-scatter diffraction (EBSD) for determining flake orientation.
  • To analyze fracture patterns during exfoliation and their relation to crystallographic axes.

Main Methods:

  • Single crystal graphite was mechanically exfoliated.
  • Scanning Tunneling Microscopy (STM) confirmed the initial crystal orientation.
  • Facet orientations and Electron Back-Scatter Diffraction (EBSD) were used to analyze flake orientations.

Main Results:

  • Single-step exfoliation resulted in a wide distribution of facet angles but a narrower distribution of true crystallographic orientations.
  • Facet orientations showed an average error of approximately [Formula: see text] from the true crystallographic orientation.
  • Graphite fractures predominantly occurred along armchair lines, increasing the proportion of zigzag lines post-cleavage.

Conclusions:

  • Mechanical exfoliation introduces predictable rotational errors in van der Waals flakes.
  • EBSD provides a more accurate measure of crystallographic orientation than facet analysis.
  • For applications requiring 1-2 degree precision, flake orientation can be estimated from the parent crystal's orientation.