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Cyclododecane-based high-intactness and clean transfer method for fabricating suspended two-dimensional materials.

Zhao Wang1,2, Wenlin Liu3,4,5, Jiaxin Shao6

  • 1College of Science, Northwest Agriculture & Forest University, Yangling, P. R. China.

Nature Communications
|August 13, 2024
PubMed
Summary

A novel polymer-free transfer method uses cyclododecane to create ultraclean, suspended 2D materials. This technique enhances graphene

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Area of Science:

  • Materials Science
  • Nanotechnology

Background:

  • Fabricating suspended 2D materials with high integrity and cleanliness is difficult due to their atomic thinness.
  • Existing transfer methods often leave polymer residues, compromising material properties.

Purpose of the Study:

  • To develop a universal, polymer-free transfer method for fabricating ultraclean suspended 2D materials.
  • To demonstrate the effectiveness of cyclododecane as a volatile transfer medium.

Main Methods:

  • Utilized volatile micro-molecule cyclododecane as a transfer medium for 2D materials.
  • Developed a polymer-free approach to ensure an intact and ultraclean surface.
  • Fabricated suspended monolayer graphene and molybdenum disulfide (MoS2).

Main Results:

  • Achieved 99% intactness for suspended monolayer graphene below 10 µm, with suspended sizes up to 36 µm.
  • Measured a high thermal conductivity of 4914 W/m·K for suspended graphene at 338 K.
  • Demonstrated efficient batch transfer capabilities and applicability to other 2D materials like MoS2.

Conclusions:

  • The cyclododecane-based method provides a pathway for producing large-area, ultraclean suspended 2D materials.
  • This technique facilitates the investigation of intrinsic properties and broadens applications in high-resolution TEM.
  • The polymer-free approach is crucial for advancing suspended graphene grids and other 2D material applications.