Physics

A swift technique to hydrophobize graphene and increase its mechanical stability and charge carrier density

L. Madauß, E. Pollmann, et al.

Discover an innovative technique for transferring single-layer graphene from copper substrates without defects, developed by researchers Lukas Madauß and colleagues. Their method enhances graphene stability and purity, presenting a breakthrough in wet-chemical transfer processes in water.

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Abstract

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

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