Graphene nanoribbons (GNRs) have attracted considerable interest, as their atomically tunable structure makes them promising candidates for future electronic devices. However, obtaining detailed information about the length of GNRs has been challenging and typically relies on low-temperature scanning tunneling microscopy. Such methods are ill-suited for practical device application and characterization. In contrast, Raman spectroscopy is a sensitive method for the characterization of GNRs, in particular for investigating their width and structure. Here, we report on a length dependent, Raman-active low-energy vibrational mode that is present in atomically precise, bottom-up-synthesized armchair graphene nanoribbons (AGNRs). Our Raman study demonstrates that this mode is present in all families of AGNRs and provides information on their length. Our spectroscopic findings are corroborated by scanning tunneling microscopy images and supported by first-principles calculations that allow us to attribute this mode to a longitudinal acoustic phonon. Finally, we show that this mode is a sensitive probe for the overall structural integrity of the ribbons and their interaction with technologically relevant substrates.

A Universal Length-Dependent Vibrational Mode in Graphene Nanoribbons / Overbeck, J; Barin, Gb; Daniels, C; Perrin, Ml; Braun, O; Sun, Q; Darawish, R; De Luca, M; Wang, Xy; Dumslaff, T; Narita, A; Mullen, K; Ruffieux, P; Meunier, V; Fasel, R; Calame, M. - In: ACS NANO. - ISSN 1936-0851. - 13:11(2019), pp. 13083-13091.

A Universal Length-Dependent Vibrational Mode in Graphene Nanoribbons

De Luca, M;
2019

Abstract

Graphene nanoribbons (GNRs) have attracted considerable interest, as their atomically tunable structure makes them promising candidates for future electronic devices. However, obtaining detailed information about the length of GNRs has been challenging and typically relies on low-temperature scanning tunneling microscopy. Such methods are ill-suited for practical device application and characterization. In contrast, Raman spectroscopy is a sensitive method for the characterization of GNRs, in particular for investigating their width and structure. Here, we report on a length dependent, Raman-active low-energy vibrational mode that is present in atomically precise, bottom-up-synthesized armchair graphene nanoribbons (AGNRs). Our Raman study demonstrates that this mode is present in all families of AGNRs and provides information on their length. Our spectroscopic findings are corroborated by scanning tunneling microscopy images and supported by first-principles calculations that allow us to attribute this mode to a longitudinal acoustic phonon. Finally, we show that this mode is a sensitive probe for the overall structural integrity of the ribbons and their interaction with technologically relevant substrates.
2019
graphene nanoribbons; Raman spectroscopy; length-dependent mode; STM; substrate transfer; vibrational modes; DFT
01 Pubblicazione su rivista::01a Articolo in rivista
A Universal Length-Dependent Vibrational Mode in Graphene Nanoribbons / Overbeck, J; Barin, Gb; Daniels, C; Perrin, Ml; Braun, O; Sun, Q; Darawish, R; De Luca, M; Wang, Xy; Dumslaff, T; Narita, A; Mullen, K; Ruffieux, P; Meunier, V; Fasel, R; Calame, M. - In: ACS NANO. - ISSN 1936-0851. - 13:11(2019), pp. 13083-13091.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1558050
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