Influence of Cu metal on the domain structure and carrier mobility in single-layer graphene

Carlo M. Orofeo, Hiroki Hibino, Kenji Kawahara, Yui Ogawa, Masaharu Tsuji, Ken Ichi Ikeda, Seigi Mizuno, Hiroki Ago

    Research output: Contribution to journalArticle

    71 Citations (Scopus)

    Abstract

    We demonstrate that domain structure of single-layer graphene grown by ambient pressure chemical vapor deposition is strongly dependent on the crystallinity of the Cu catalyst. Low energy electron microscopy analysis reveals that graphene grown using a Cu foil gives small and mis-oriented graphene domains with a number of domain boundaries. On the other hand, no apparent domain boundaries are observed in graphene grown over a heteroepitaxial Cu(111) film deposited on sapphire due to unified orientation of graphene hexagons. The difference in the domain structures is correlated with the difference in the crystal plane and grain structure of the Cu metal. The graphene film grown on the heteroepitaxial Cu film exhibits much higher carrier mobility than that grown on the Cu foil.

    Original languageEnglish
    Pages (from-to)2189-2196
    Number of pages8
    JournalCarbon
    Volume50
    Issue number6
    DOIs
    Publication statusPublished - May 1 2012

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Materials Science(all)

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