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Toward Clean Suspended CVD Graphene.

Alexander Yulaev1, Guangjun Cheng2, Angela R Hight Walker2

  • 1Center for Nanoscale Science and Technology, NIST, Gaithersburg, MD 20899, USA; Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA; Maryland NanoCenter, University of Maryland, College Park, MD 20742, USA.

RSC Advances
|December 7, 2016
PubMed
Summary
This summary is machine-generated.

A new method uses anthracene as a sacrificial layer for clean graphene transfer, crucial for applications like electron microscopy and sensitive devices. This anthracene-assisted technique yields superior suspended graphene quality compared to existing methods.

Keywords:
anthracenegraphene transferpurityscanning electron microscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Suspended graphene is vital for electron microscopy, vacuum electronics, and micromechanical devices.
  • Current graphene transfer methods often lack cleanliness and can be destructive.
  • Achieving clean, suspended graphene is essential for advanced device integration.

Purpose of the Study:

  • To develop a minimally destructive and maximally clean method for transferring suspended graphene.
  • To utilize thermally evaporated anthracene films as a sacrificial layer for graphene transfer.
  • To demonstrate the superiority of the anthracene method over existing techniques.

Main Methods:

  • Thermally evaporated anthracene films served as sacrificial layers for graphene transfer.
  • Anthracene desorption occurred at 100 °C to 150 °C.
  • Sequential annealing steps with Pt catalyst and activated carbon were used for final cleaning.

Main Results:

  • Clean suspended graphene was successfully achieved via anthracene desorption.
  • Low energy scanning electron microscopy and X-ray photoelectron Spectroscopy confirmed membrane cleanliness.
  • The anthracene method produced larger areas of clean, suspended chemical vapor deposition (CVD) graphene compared to other methods.

Conclusions:

  • The anthracene-based graphene transfer method offers superior cleanliness and quality.
  • This technique enables the integration of cleaner graphene into heat and humidity-sensitive devices.
  • The developed method advances the application of suspended graphene in complex electronic and mechanical systems.