Band depopulation of graphene nanoribbons induced by chemical gating with amino groups

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URI: https://hdl.handle.net/10902/34977
ISSN: 1936-0851
ISSN: 1936-086X
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Autoría
Li, Jingcheng; Brandimarte Mendonça, Pedro; Vilas Varela, Manuel; Merino Díez, Nestor; Moreno Sierra, CésarAutoridad Unican; Mugarza, Aitor; Sáez Mollejo, Jaime; Sanchez-Portal, Daniel; Garcia de Oteyza, Dimas; Corso, Martina; Garcia-Lekue, Aran; Peña, Diego; Pascual, José I.
Fecha
2020-10
Derechos
© ACS. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see: https://dx.doi.org/10.1021/acsnano.9b08162.
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ACS Nano, 2020, 14(2), 1895-1901
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American Chemical Society
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Palabras clave
Scanning tunneling microscope
Density functional theory
Chiral graphene nanoribbons
Doping
Amino
Chemical gating
Dand depopulation
Resumen/Abstract
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.
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