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Title

Revealing the electronic structure of silicon intercalated armchair graphene nanoribbons by scanning tunneling spectroscopy

AuthorsDeniz, Okan; Sánchez, Carlos ; Dumslaff, Tim; Feng, Xinliang; Narita, Akimitsu.; Mullen, Klaus; Kharche, Neerav; Meunier, Vincent; Fasel, Roman; Ruffieux, Pascal
KeywordsScreening
Scanning tunneling spectroscopy
Density functional theory
Surface alloying
Intercalation
Graphene nanoribbon
Issue Date12-Apr-2017
PublisherAmerican Chemical Society
CitationNano Letters 17(4): 2197-2203 (2017)
AbstractThe 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.
Publisher version (URL)https://doi.org/10.1021/acs.nanolett.6b04727
URIhttp://hdl.handle.net/10261/188858
Identifiersdoi: 10.1021/acs.nanolett.6b04727
e-issn: 1530-6992
issn: 1530-6984
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