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Effect of functional groups on the formation and self-assembly of graphene nanoribbons

AuthorsPanighel, Mirko; Moreno, César ; García-Lekue, Aran; Peña, Diego; Ceballos, Gustavo ; Mugarza, Aitor
Issue Date2016
PublisherCSIC-ICN Centro de Investigación en Nanociencia y Nanotecnología (CIN2)
CitationFuerzas y Túnel (2016)
AbstractBottom-up processes involving the coupling of molecular precursors enable synthesizing atomically precise, functionalized graphene nanoribbons (GNR). This in turn opens up a new route to tailor the electronic and chemical properties of GNRs. Here we present a comparative study on the growth, structural characterization and chemical stability of zig-zag shaped functionalized GNRs obtained by the surface-assisted coupling of specifically synthesized molecular precursors on the Au(111) surface (Figure 1 a, b). Scanning tunneling microscopy (STM) shows that these precursors lead to straight and almost defect free GNRs (Figure 1c). By means of X-ray photoelectron spectroscopy (XPS) we are able to follow the different reaction steps (namely debromination and cyclodehydrogenation) resulting in the synthesis of the nanoribbons. Moreover, the combination of the two techniques allows us to check the chemical stability of the functional radicals, observing, in particular, that the methoxy group, though not surviving to the cyclodehydrogenation reaction, differently from the fluorine radical, still strongly affects the formation and self-assembly of the nanoribbons on the surface.
DescriptionResumen del póster presentado a la 10th Conferencia Fuerzas y Túnel, celebrada en Girona (España) del 5 al 7 de septiembre de 2016.-- et al.
Appears in Collections:(CIN2) Comunicaciones congresos
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