| Literature DB >> 31999431 |
Jingcheng Li1, Pedro Brandimarte2, Manuel Vilas-Varela3, Nestor Merino-Díez1,2, Cesar Moreno4, Aitor Mugarza4,5, Jaime Sáez Mollejo2, Daniel Sánchez-Portal2,6, Dimas Garcia de Oteyza2,6,7, Martina Corso2,6, Aran Garcia-Lekue2,7, Diego Peña3, Jose Ignacio Pascual1,7.
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.Entities:
Keywords: amino; band depopulation; chemical gating; chiral graphene nanoribbons; density functional theory; doping; scanning tunneling microscopy
Year: 2020 PMID： 31999431 DOI： 10.1021/acsnano.9b08162
Source DB: PubMed Journal: ACS Nano ISSN： 1936-0851 Impact factor: 15.881