Journal
NANO LETTERS
Volume 17, Issue 4, Pages 2197-2203Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04727
Keywords
Graphene nanoribbon; intercalation; surface alloying; scanning tunneling spectroscopy; density functional theory; screening
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Funding
- Swiss National Science Foundation
- Office of Naval Research BRC program
- European Commission Graphene Flagship [CNECT-ICT-604391]
- Ministerio de Economia y Competitividad via the Juan de la Cierva Incorporacion Grant - European Investment Bank [IJCI-2014-19291]
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The electronic properties of graphene nanoribbons grown on metal substrates are significantly masked by the ones of the supporting metal surface. Here, we introduce a novel approach to access the frontier states of armchair graphene nanoribbons (AGNRs). The in situ intercalation of Si at the AGNR/Au(111) interface through surface alloying suppresses the strong contribution of the Au(111) surface state and allows for an unambiguous determination of the frontier electronic states of both wide and narrow band gap AGNRs. First-principles calculations provide insight into substrate induced screening effects, which result in a width-dependent band gap reduction for substrate-supported AGNRs. The strategy reported here provides a unique opportunity to elucidate the electronic properties of various kinds of graphene nanomaterials supported on metal substrates.
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