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Versatile Polymer-Free Graphene Transfer Method and Applications.

Guohui Zhang1, Aleix G Güell1, Paul M Kirkman1

  • 1Department of Chemistry, University of Warwick , Coventry CV4 7AL, United Kingdom.

ACS Applied Materials & Interfaces
|March 9, 2016
PubMed
Summary

A novel method enables contamination-free transfer of chemical vapor deposition (CVD) monolayer graphene to diverse substrates, including 3D structures. This technique facilitates advanced applications in conductive AFM imaging and TEM substrate development.

Keywords:
conductive AFMelectrochemistryfreestanding graphenegraphene TEM gridsgraphene transfer

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Chemical vapor deposition (CVD) is crucial for synthesizing high-quality monolayer graphene.
  • Transferring CVD graphene to target substrates often involves polymers, leading to contamination and performance issues.
  • Developing polymer-free transfer methods is essential for realizing graphene's full potential.

Purpose of the Study:

  • To introduce a new, polymer-free method for transferring CVD-grown monolayer graphene.
  • To demonstrate the transfer of graphene to various substrates, including complex 3D architectures.
  • To explore the utility of transferred graphene in applications like conductive AFM and TEM.

Main Methods:

  • Utilized an organic/aqueous biphasic system (hexane/aqueous ammonium persulfate) for copper etching.
  • Employed an Si/SiO2 substrate at a secondary hexane/water interface to remove etching byproducts.
  • Transferred graphene to arbitrary substrates, including atomic force microscopy (AFM) tips and transmission electron microscopy (TEM) grids.

Main Results:

  • Achieved conformal graphene coating on AFM tips, enabling conductive AFM imaging.
  • Created large-area, electron-transparent graphene/TEM grids for high-resolution imaging.
  • Demonstrated the use of these substrates as working electrodes for electrochemistry and wetting studies.
  • Utilized scanning electrochemical cell microscopy to compare electrochemical and wetting behaviors on freestanding vs. copper-supported graphene.

Conclusions:

  • The developed biphasic transfer method effectively transfers CVD monolayer graphene without polymer contamination.
  • This technique allows for the creation of advanced graphene-based substrates and devices for nanoscale imaging and electrochemical analysis.
  • The method broadens the applicability of graphene in fields requiring high-performance, contamination-free interfaces.