Transferring CVD-grown single-layer graphene from copper substrates without introducing defects remains challenging. This paper presents a pre-treatment technique involving pressing an ethylene-vinyl acetate copolymer foil onto the graphene/copper, which stabilizes the graphene by attaching functional carbon groups. This allows for a polymer-free, wet-chemical transfer in an all-H₂O environment. The authors demonstrate that graphene crumbling in water is due to polar interactions, not surface energy differences. The pre-treatment results in highly crystalline, clean graphene with near 100% coverage, low defect density, and high charge carrier density.
Publisher
npj 2D Materials and Applications
Published On
May 18, 2020
Authors
Lukas Madauß, Erik Pollmann, Tobias Foller, Jens Schumacher, Ulrich Hagemann, Tobias Heckhoff, Matthias Herder, Lucia Skopinski, Lars Breuer, Anke Hierzenberger, Alexandra Wittmar, Henning Lebius, Abdenacer Benyagoub, Mathias Ulbricht, Rakesh Joshi, Marika Schleberger
Tags
graphene
CVD-grown
transfer technique
defects
wet-chemical process
ethylene-vinyl acetate
polar interactions
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