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Ultra-narrow metallic armchair graphene nanoribbons

Author

Listed:
  • Amina Kimouche

    (Aalto University School of Science)

  • Mikko M. Ervasti

    (COMP Centre of Excellence, Aalto University School of Science)

  • Robert Drost

    (Aalto University School of Science)

  • Simo Halonen

    (Aalto University School of Chemical Technology)

  • Ari Harju

    (COMP Centre of Excellence, Aalto University School of Science)

  • Pekka M. Joensuu

    (Aalto University School of Chemical Technology)

  • Jani Sainio

    (Aalto University School of Science)

  • Peter Liljeroth

    (Aalto University School of Science)

Abstract

Graphene nanoribbons (GNRs)—narrow stripes of graphene—have emerged as promising building blocks for nanoelectronic devices. Recent advances in bottom-up synthesis have allowed production of atomically well-defined armchair GNRs with different widths and doping. While all experimentally studied GNRs have exhibited wide bandgaps, theory predicts that every third armchair GNR (widths of N=3m+2, where m is an integer) should be nearly metallic with a very small bandgap. Here, we synthesize the narrowest possible GNR belonging to this family (five carbon atoms wide, N=5). We study the evolution of the electronic bandgap and orbital structure of GNR segments as a function of their length using low-temperature scanning tunnelling microscopy and density-functional theory calculations. Already GNRs with lengths of 5 nm reach almost metallic behaviour with ∼100 meV bandgap. Finally, we show that defects (kinks) in the GNRs do not strongly modify their electronic structure.

Suggested Citation

  • Amina Kimouche & Mikko M. Ervasti & Robert Drost & Simo Halonen & Ari Harju & Pekka M. Joensuu & Jani Sainio & Peter Liljeroth, 2015. "Ultra-narrow metallic armchair graphene nanoribbons," Nature Communications, Nature, vol. 6(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms10177
    DOI: 10.1038/ncomms10177
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    Cited by:

    1. Hiroshi Sakaguchi & Takahiro Kojima & Yingbo Cheng & Shunpei Nobusue & Kazuhiro Fukami, 2024. "Electrochemical on-surface synthesis of a strong electron-donating graphene nanoribbon catalyst," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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