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On-surface synthesis of graphene nanoribbons with zigzag edge topology

Nature (London), 2016-03, Vol.531 (7595), p.489-492 [Peer Reviewed Journal]

COPYRIGHT 2016 Nature Publishing Group ;COPYRIGHT 2016 Nature Publishing Group ;Copyright Nature Publishing Group Mar 24, 2016 ;ISSN: 0028-0836 ;EISSN: 1476-4687 ;DOI: 10.1038/nature17151 ;PMID: 27008967 ;CODEN: NATUAS

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  • Title:
    On-surface synthesis of graphene nanoribbons with zigzag edge topology
  • Author: Ruffieux, Pascal ; Wang, Shiyong ; Yang, Bo ; Sánchez-Sánchez, Carlos ; Liu, Jia ; Dienel, Thomas ; Talirz, Leopold ; Shinde, Prashant ; Pignedoli, Carlo A ; Passerone, Daniele ; Dumslaff, Tim ; Feng, Xinliang ; Müllen, Klaus ; Fasel, Roman
  • Subjects: Carbon ; Chemical research ; Graphene ; Graphite ; Microscopy ; Morphology ; Nanoparticles ; Nanostructured materials ; Polymerization ; Production processes ; Topology
  • Is Part Of: Nature (London), 2016-03, Vol.531 (7595), p.489-492
  • Description: Graphene-based nanostructures exhibit electronic properties that are not present in extended graphene. For example, quantum confinement in carbon nanotubes and armchair graphene nanoribbons leads to the opening of substantial electronic bandgaps that are directly linked to their structural boundary conditions. Nanostructures with zigzag edges are expected to host spin-polarized electronic edge states and can thus serve as key elements for graphene-based spintronics. The edge states of zigzag graphene nanoribbons (ZGNRs) are predicted to couple ferromagnetically along the edge and antiferromagnetically between the edges, but direct observation of spin-polarized edge states for zigzag edge topologies--including ZGNRs--has not yet been achieved owing to the limited precision of current top-down approaches. Here we describe the bottom-up synthesis of ZGNRs through surface-assisted polymerization and cyclodehydrogenation of specifically designed precursor monomers to yield atomically precise zigzag edges. Using scanning tunnelling spectroscopy we show the existence of edge-localized states with large energy splittings. We expect that the availability of ZGNRs will enable the characterization of their predicted spin-related properties, such as spin confinement and filtering, and will ultimately add the spin degree of freedom to graphene-based circuitry.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 0028-0836
    EISSN: 1476-4687
    DOI: 10.1038/nature17151
    PMID: 27008967
    CODEN: NATUAS
  • Source: ProQuest One Psychology
    AUTh Library subscriptions: ProQuest Central
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