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Doping of graphene nanoribbons via functional group edge modification

AuthorsCarbonell, Eduard; Hieulle, Jeremy; Vilas-Varela, Manuel; Brandimarte, Pedro; Iraola, Mikel; Barragán, Ana; Li, Jingcheng; Abadia, Mikel; Corso, Martina CSIC ORCID ; Sánchez-Portal, Daniel CSIC ORCID ; Peña, Diego; Pascual, José I.
KeywordsFunctional group
Density functional theory
Graphene nanoribbons
Scanning tunneling microscopy
Issue Date2017
PublisherAmerican Chemical Society
CitationACS Nano 11(7): 7355-7361 (2017)
AbstractWe report the on-surface synthesis of 7-armchair graphene nanoribbons (7-AGNRs) substituted with nitrile (CN) functional groups. The CN groups are attached to the GNR backbone by modifying the 7-AGNR precursor. Whereas many of these groups survive the on-surface synthesis, the reaction process causes the cleavage of some CN from the ribbon backbone and the on-surface cycloisomerization of few nitriles onto pyridine rings. Scanning tunneling spectroscopy and density functional theory reveal that CN groups behave as very efficient n-dopants, significantly downshifting the bands of the ribbon and introducing deep impurity levels associated with the nitrogen electron lone pairs.
Publisher version (URL)https://doi.org/10.1021/acsnano.7b03522
Identifiersdoi: 10.1021/acsnano.7b03522
e-issn: 1936-086X
issn: 1936-0851
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