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Página principal > Artículos > Artículos publicados > Stabilizing edge fluorination in graphene nanoribbons |
Fecha: | 2020 |
Resumen: | The on-surface synthesis of edge-functionalized graphene nanoribbons (GNRs) is challenged by the stability of the functional groups throughout the thermal reaction steps of the synthetic pathway. Edge fluorination is a particularly critical case in which the interaction with the catalytic substrate and intermediate products can induce the complete cleavage of the otherwise strong C-F bonds before the formation of the GNR. Here, we demonstrate how a rational design of the precursor can stabilize the functional group, enabling the synthesis of edge-fluorinated GNRs. The survival of the functionalization is demonstrated by tracking the structural and chemical transformations occurring at each reaction step with complementary X-ray photoelectron spectroscopy and scanning tunneling microscopy measurements. In contrast to previous attempts, we find that the C-F bond survives the cyclodehydrogenation of the intermediate polymers, leaving a thermal window where GNRs withhold more than 80% of the fluorine atoms. We attribute this enhanced stability of the C-F bond to the particular structure of our precursor, which prevents the cleavage of the C-F bond by avoiding interaction with the residual hydrogen originated in the cyclodehydrogenation. This structural protection of the linking bond could be implemented in the synthesis of other sp2-functionalized GNRs. |
Ayudas: | European Commission 863098 European Commission 600385 Ministerio de Economía y Competitividad SEV-2017-0706 Ministerio de Economía y Competitividad FIS2017-83780-P Ministerio de Economía y Competitividad MAT2016-78293-C6 |
Derechos: | Tots els drets reservats. |
Lengua: | Anglès |
Documento: | Article ; recerca ; Versió sotmesa a revisió |
Materia: | Graphene nanoribbons ; On-surface synthesis ; Edge-functionalization ; Fluorination ; Scanning tunneling microscopy ; Density functional theory ; Self-assembly |
Publicado en: | ACS nano, Vol. 14, issue 9 (Sep. 2020) , p. 11120-11129, ISSN 1936-086X |
Preprint 30 p, 2.2 MB |