Synthesis of high-density arrays of graphene nanoribbons by anisotropic metal-assisted etching

Hiroki Ago, Yasumichi Kayo, Pablo Solís-Fernández, Kazuma Yoshida, Masaharu Tsuji

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    We demonstrate the synthesis of highly aligned dense arrays of graphene nanoribbons (GNRs) based on metal-assisted etching of chemical vapor deposition-grown single-layer graphene. In order to obtain GNR arrays, controlling the direction of the etching becomes an important task. Crystalline surfaces of r- and a-planes of sapphire (α-Al2O3) were found to induce anisotropic etching of the graphene along their specific crystallographic directions. In contrast, anisotropic surface of ST-cut quartz induced few etching lines. We found that the graphene etching is strongly dependent on the metal species; the order of the catalytic activity of metal nanoparticles is Ni > Fe > > Cu. Etching temperature and H2 concentration also strongly influenced the density and quality of the etching lines. Our anisotropic graphene etching is expected to offer a new route toward the synthesis of high density GNR array in large area without relying on any lithographic techniques for future electronic devices.

    Original languageEnglish
    Pages (from-to)339-346
    Number of pages8
    JournalCarbon
    Volume78
    DOIs
    Publication statusPublished - Nov 2014

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Materials Science(all)

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