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Structural Defects Modulate Electronic and Nanomechanical Properties of 2D Materials.

Manoj Tripathi1, Frank Lee1, Antonios Michail2,3

  • 1Department of Physics and Astronomy, University of Sussex, Brighton BN1 9RH, United Kingdom.

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|January 25, 2021
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Summary

Out-of-plane deformation in 2D materials like graphene and molybdenum disulfide significantly impacts their electronic and nanomechanical properties. This study reveals how different line defects influence strain, doping, and stiffness, offering insights for straintronic device engineering.

Keywords:
2D materialsdefectsdopingstiffnessstrainwrinkles

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials, including graphene and molybdenum disulfide (MoS2), are susceptible to out-of-plane deformations.
  • The effects of these physical distortions on their electronic and nanomechanical properties are not fully understood.
  • Line defects such as wrinkles and grain boundaries are common in these materials.

Purpose of the Study:

  • To investigate the influence of different line defect geometries on the electronic and nanomechanical properties of graphene and MoS2.
  • To understand how strain and doping are affected by these defects.
  • To explore the impact of defects on the local stiffness of 2D materials.

Main Methods:

  • Atomic force microscopy (AFM) for nanomechanical property mapping.
  • Raman spectroscopy for strain and doping analysis.
  • Density functional theory (DFT) calculations to study band structure alterations.

Main Results:

  • Wrinkles in graphene exhibit higher stiffness than MoS2 due to stronger covalent bonding.
  • Deflated graphene nanobubbles show the lowest stiffness among graphene defects.
  • DFT calculations confirm band structure modulation, which is more pronounced in MoS2.
  • Wrinkles show significant strain but minimal doping; edges show significant doping but minimal strain.
  • Graphene defects primarily exhibit compressive strain and increased carrier density.
  • MoS2 defects show predominantly tensile strain and reduced carrier density, with increasing tensile strain reducing doping.

Conclusions:

  • Intrinsic structural defects significantly influence the electronic and nanomechanical characteristics of 2D materials.
  • Understanding these defect-property relationships is crucial for designing advanced straintronic devices.
  • The study provides fundamental insights into nanoscale defect engineering for tailored material functionalities.