Doping of Graphene Nanoribbons via Functional Group Edge Modification

作者：Carbonell Sanroma Eduard^*; Hieulle Jeremy; Vilas Varela Manuel; Brandimarte Pedro; Lraola Mikel; Barragan Ana; Li Jingcheng; Abadia Mikel; Corso Martina; Sanchez Portal Daniel; Pena Diego^*; Ignacio Pascual Jose

来源：ACS Nano, 2017, 11(7): 7355-7361.

DOI：10.1021/acsnano.7b03522

• scanning tunneling microscopy
• density functional theory
• graphene nanoribbons
• doping functional group
• cyano

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.

• 出版日期2017-7