Band Depopulation of Graphene Nanoribbons Induced by Chemical Gating with Amino Groups

The electronic properties of graphene nanoribbons (GNRs) can be precisely tuned by chemical doping. Here we demonstrate that amino (NH2) functional groups attached at the edges of chiral GNRs (chGNRs) can efficiently gate the chGNRs and lead to the valence band (VB) depopulation on a metallic surfac...

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Bibliographic Details
Published in:ACS nano 2020-02, Vol.14 (2), p.1895-1901
Main Authors: Li, Jingcheng, Brandimarte, Pedro, Vilas-Varela, Manuel, Merino-Díez, Nestor, Moreno, Cesar, Mugarza, Aitor, Mollejo, Jaime Sáez, Sánchez-Portal, Daniel, Garcia de Oteyza, Dimas, Corso, Martina, Garcia-Lekue, Aran, Peña, Diego, Pascual, Jose Ignacio
Format: Article
Language:English
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Summary:The electronic properties of graphene nanoribbons (GNRs) can be precisely tuned by chemical doping. Here we demonstrate that amino (NH2) functional groups attached at the edges of chiral GNRs (chGNRs) can efficiently gate the chGNRs and lead to the valence band (VB) depopulation on a metallic surface. The NH2-doped chGNRs are grown by on-surface synthesis on Au(111) using functionalized bianthracene precursors. Scanning tunneling spectroscopy resolves that the NH2 groups significantly upshift the bands of chGNRs, causing the Fermi level crossing of the VB onset of chGNRs. Through density functional theory simulations we confirm that the hole-doping behavior is due to an upward shift of the bands induced by the edge NH2 groups.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.9b08162