Role of grain boundaries in tailoring electronic properties of polycrystalline graphene by chemical functionalization

Max Seifert, Jose E.B. Vargas, Marco Bobinger, Matthias Sachsenhauser, Aron W. Cummings, Stephan Roche, Jose A. Garrido

    Research output: Contribution to journalArticleResearchpeer-review

    28 Citations (Scopus)

    Abstract

    © 2015 IOP Publishing Ltd. Grain boundaries, inevitably present in chemical vapor deposited graphene, are expected to have considerable impact on the development of graphene-based hybrid materials with tailored material properties.Wedemonstrate here the critical role of polycrystallinity on the chemical functionalization of graphene comparing ozone-induced oxidation with remote plasma hydrogenation.Weshow that graphene oxidation and hydrogenation occur in two consecutive stages upon increasing defect density: an initial step in which surface-bound functional groups are generated, followed by the creation of vacancies. Remarkably, we find that hydrogenation yields homogeneously distributed defects while ozone-induced defects are preferentially accumulated at the grain boundaries eventually provoking local cracking of the structure. Supported by quantum simulations, our experimental findings reveal distinct electronic transport regimes depending on the density and distribution of induced defects on the polycrystalline graphene films. Our findings highlight the key role played by grain boundaries during graphene functionalization, and at the same time provide a novel perspective to tailor the properties of polycrystalline graphene.
    Original languageEnglish
    Article number024008
    Journal2D Materials
    Volume2
    Issue number2
    DOIs
    Publication statusPublished - 6 May 2015

    Keywords

    • Functionalization
    • Grain boundary
    • Graphene
    • Hydrogenation
    • Oxidation
    • Polycrystalline

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