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Doping of Graphene Nanoribbons via Functional Group Edge Modification

2017; American Chemical Society; Volume: 11; Issue: 7 Linguagem: Inglês

10.1021/acsnano.7b03522

1936-086X

Eduard Carbonell-Sanromà, Jérémy Hieulle, Manuel Vilas‐Varela, Pedro Brandimarte, Mikel Iraola, Ana Barragán, Jingcheng Li, Mikel Abadía, Martina Corso, Daniel Sánchez‐Portal, Diego Peña, José Ignacio Pascual,

Surface and Thin Film Phenomena

We 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.