Doping of Graphene Nanoribbons via Functional Group Edge Modification
ACS Nano - 2017
Eduard Carbonell-Sanromà, Jeremy Hieulle, Manuel Vilas-Varela, Pedro Brandimarte, Mikel Iraola, Ana Barragán, Jingcheng Li, Mikel Abadia, Martina Corso, Daniel Sánchez-Portal, Diego Peña, and Jose Ignacio PascualAbstract
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.
Press release
Bibtex citation
@Article{Carbonell-Sanroma2017a,
author = {Eduard Carbonell-Sanrom{\`{a}} and Jeremy Hieulle and Manuel Vilas-Varela and Pedro Brandimarte and Mikel Iraola and Ana Barrag{\'{a}}n and Jingcheng Li and Mikel Abadia and Martina Corso and Daniel S{\'{a}}nchez-Portal and Diego Pe{\~{n}}a and Jose Ignacio Pascual},
title = {Doping of Graphene Nanoribbons \textit{via} Functional Group Edge Modification},
journal = {ACS Nano},
year = {2017},
volume = {11},
number = {7},
pages = {7355--7361},
issn = {1936--0851},
doi = {10.1021/acsnano.7b03522},
publisher = {American Chemical Society ({ACS})},
}
Key words
- graphene nanoribbons
- chemical functionalization
- scanning tunneling microscopy
- electronic structure
- density functional theory