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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
Transformation of Plane Strain01:12

Transformation of Plane Strain

When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...

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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
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Published on: July 17, 2015

Strain in epitaxial graphene visualized by intercalation.

Stefan Schumacher1, Daniel F Förster, Malte Rösner

  • 1II Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany. sschumacher@ph2.uni-koeln.de

Physical Review Letters
|March 12, 2013
PubMed
Summary

Europium (Eu) intercalation under graphene on iridium (Ir) forms patterns aligned with the graphene moiré. These patterns are dictated by substrate binding and graphene strain, revealing insights into nanoscale material organization.

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Area of Science:

  • Surface Science
  • Materials Science
  • Condensed Matter Physics

Background:

  • Graphene on iridium (Ir)(111) exhibits moiré patterns due to lattice mismatch.
  • Intercalation of elements under graphene can modify substrate-graphene interactions.
  • Strain in graphene films influences their electronic and structural properties.

Purpose of the Study:

  • To investigate the structural patterns formed by Europium (Eu) intercalation under graphene on Ir(111).
  • To understand the role of substrate binding and graphene strain in pattern formation.
  • To correlate intercalation density with substrate and graphene characteristics.

Main Methods:

  • Europium (Eu) deposition and intercalation under graphene grown on Ir(111).
  • Surface characterization techniques (e.g., Scanning Tunneling Microscopy) to observe nanoscale patterns.
  • Analysis of pattern orientation, morphology (stripes, islands, channels), and density.

Main Results:

  • Eu intercalation forms ordered patterns aligned with the graphene moiré unit mesh.
  • Observed patterns include stripes, compact islands, and channels.
  • A constant saturation value for step concentration was found across varying Eu amounts, linked to chemically modulated binding and pre-existing graphene strain.

Conclusions:

  • Graphene-substrate chemical interactions and inherent strain significantly dictate Eu intercalation patterns.
  • The observed patterns are quantized by the graphene moiré unit mesh.
  • Local strain variations in graphene correlate with local differences in Eu intercalation density.