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Surface-guided graphene nanoribbon superlattices

AuthorsMoreno, César ; Paradinas, Markos ; Vilas-Varela, Manuel; Panighel, Mirko ; Ceballos, Gustavo ; Peña, Diego; Mugarza, Aitor
Issue Date2018
CitationInternational workshop On-Surface Synthesis (2018)
AbstractThe on-surface synthesis of graphene nanoribbons (GNRs) has been subject of intense research in recent years. Focused mainly on the realization of GNRs with different shape, edge structure and chemical composition, few studies have paid attention to the control of their distribution throughout the surface, which is critical for integration in devices. The most representative advance in this direction has been the use of stepped surfaces as templates to align the GNRs along one direction at the cm scale, a distribution that can be then replicated after transfer to insulating substrates. Here we show how the herringbone reconstruction can be used as template for inducing different GNR superlattice patterns. Hydrogenated and fluorinated triphenylene derivatives lead to GNRs that interact strongly with the surface reconstruction, which constrains their growth along the fcc domains. This results in a 2D superlattice that replicates the herringbone pattern, and limits the GNR size to the straight domains of the zig-zag. In contrast, GNRs obtained with diphenyl–DBBA undergo a more subtle interaction, where the interaction with the reconstruction is only exploited for the parallel alignment of GNRs without limiting their size. As a consequence we obtain parallel arrays of ultra-long GNRs (>100nm) of different periodicity depending on the coverage (Fig .1). The parallel distribution is optimum for the realization of multichannel electronic devices and optical superlattices, and additionally provides an ideal configuration for the subsequent lateral coupling of GNRs that give rise to nanoporous graphene.
DescriptionResumen del trabajo presentado al International workshop On-Surface Synthesis (OSS), celebrado en Sant Feliu de Guíxol (España) del 23 al 28 de septiembre de 2018.
Appears in Collections:(CIN2) Comunicaciones congresos
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