Termini of bottom-up fabricated graphene nanoribbons.

J Am Chem Soc

Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.

Published: February 2013

AI Article Synopsis

  • Graphene nanoribbons (GNRs) can be created on metal surfaces through a heating process involving specific precursor molecules.
  • The ends of the armchair GNRs studied exhibit a zigzag edge, which produces a unique electronic state detectable by scanning tunneling microscopy (STM).
  • Combining STM experiments with theoretical calculations indicates that hydrogen atoms passivate the GNR termini, potentially limiting the growth length of the nanoribbons.

Article Abstract

Atomically precise graphene nanoribbons (GNRs) can be obtained via thermally induced polymerization of suitable precursor molecules on a metal surface. This communication discusses the atomic structure found at the termini of armchair GNRs obtained via this bottom-up approach. The short zigzag edge at the termini of the GNRs under study gives rise to a localized midgap state with a characteristic signature in scanning tunneling microscopy (STM). By combining STM experiments with large-scale density functional theory calculations, we demonstrate that the termini are passivated by hydrogen. Our results suggest that the length of nanoribbons grown by this protocol may be limited by hydrogen passivation during the polymerization step.

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Source
http://dx.doi.org/10.1021/ja311099kDOI Listing

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