Termini of Bottom-Up Fabricated Graphene Nanoribbons
Journal of the American Chemical Society2013Vol. 135(6), pp. 2060–2063
Citations Over TimeTop 1% of 2013 papers
Leopold Talirz, Hajo Söde, Jinming Cai, Pascal Ruffieux, S. Blankenburg, Rached Jafaar, Reinhard Berger, Xinliang Feng, Kläus Müllen, Daniele Passerone, Román Fasel, Carlo A. Pignedoli
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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