Journal
ACS NANO
Volume 11, Issue 7, Pages 7355-7361Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b03522
Keywords
scanning tunneling microscopy; density functional theory; graphene nanoribbons; doping functional group; cyano
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Funding
- FP7 FET-ICT Planar Atomic and Molecular Scale devices (PAMS) project - European Commission [610446]
- Agenda Estatal de Investigacion Cooperative Grant [MAT2016-78293, FIS 2015-62538-ERC]
- Basque Government (Dep. de Educacion)
- Basque Government (UPV/EHU) [IT-756-13]
- Basque Government (Dep. Industry) [PI_2015_1_42]
- Xunta de Galicia (Centro singular de investigacion de Galicia accreditation) [ED431G/09]
- European Regional Development Fund (ERDF)
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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.
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