5 years ago

Doping of Graphene Nanoribbons via Functional Group Edge Modification

Doping of Graphene Nanoribbons via Functional Group Edge Modification
Jingcheng Li, Daniel Sánchez-Portal, Mikel Abadia, Manuel Vilas-Varela, Mikel Iraola, Diego Peña, Pedro Brandimarte, Jeremy Hieulle, Eduard Carbonell-Sanromà, Martina Corso, Ana Barragán, Jose Ignacio Pascual
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.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b03522

DOI: 10.1021/acsnano.7b03522

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