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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Single-layer graphene (SLG) produced via chemical vapor deposition (CVD) is a promising material.
  • Developing methods to create multilayer graphene (MLG) with controlled properties is crucial for advanced applications.

Purpose of the Study:

  • To introduce an alternative fabrication route for weakly interacting multilayer graphene (wi-MLG).
  • To investigate the structural integrity and properties of graphene after nanomechanical folding.

Main Methods:

  • Utilizing an atomic force microscopy (AFM) tip to induce nanomechanical folding of CVD-grown SLG.
  • Employing Raman microscopy with various spectral analyses (e.g., AD/AG, ω2D, Γ2D) to characterize the folded graphene.

Main Results:

  • Demonstrated successful folding of SLG into a few tens of graphene layers using AFM tip manipulation.
  • Confirmed that in-plane properties of the original SLG are largely maintained.
  • Observed a blue shift of ~20 cm-1 in the 2D band, indicating changes in electronic structure.
  • Correlated the relative intensities of 2D- and 2D+ bands with structural defects.

Conclusions:

  • Nanomechanical folding is a viable method for producing wi-MLG from SLG.
  • The process results in stacked graphene with minimal structural defects.
  • Raman spectroscopy provides insights into defect mechanisms and electronic properties near the Dirac cone.