http://www.cnr.it/ontology/cnr/individuo/prodotto/ID192894

Oxygen Switching of the Epitaxial Graphene-Metal Interaction (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Oxygen Switching of the Epitaxial Graphene-Metal Interaction (Articolo in rivista) (literal)

Anno

2012-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1021/nn302729j (literal)

Alternative label

Rosanna Larciprete (1); Søren Ulstrup (2); Paolo Lacovig (3); Matteo Dalmiglio (3); Marco Bianchi (2); Federico Mazzola (2); Liv Hornekær (2); Fabrizio Orlando (4,5); Alessandro Baraldi (4,5); Philip Hofmann (2); Silvano Lizzit (3) (2012)
Oxygen Switching of the Epitaxial Graphene-Metal Interaction
in ACS nano (Online); ACS, American chemical society, Washington, DC (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Rosanna Larciprete (1); Søren Ulstrup (2); Paolo Lacovig (3); Matteo Dalmiglio (3); Marco Bianchi (2); Federico Mazzola (2); Liv Hornekær (2); Fabrizio Orlando (4,5); Alessandro Baraldi (4,5); Philip Hofmann (2); Silvano Lizzit (3) (literal)

Pagina inizio

9551 (literal)

Pagina fine

9558 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://pubs.acs.org/doi/abs/10.1021/nn302729j?prevSearch=%255BContrib%253A%2Blarciprete%255D&searchHistoryKey= (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

6 (literal)

Rivista

ACS nano (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

8 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

11 (literal)

Note

Scopu (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

1 CNR-Institute for Complex Systems, Via Fosso del Cavaliere 100, 00133 Roma, Italy 2 Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark 3 Sincrotrone Trieste, S.S. 14 Km 163.5, 34149 Trieste, Italy 4 Physics Department and Center of Excellence for Nanostructured Materials, University of Trieste, Via Valerio 2, 34127 Trieste, Italy 5 IOM-CNR Laboratorio TASC, Area Science Park, S.S.14 Km 163.5, 34149 Trieste, Italy (literal)

Titolo

Oxygen Switching of the Epitaxial Graphene-Metal Interaction (literal)

Abstract

Using photoemission spectroscopy techniques, we show that oxygen intercalation is achieved on an extended layer of epitaxial graphene on Ir(111), which results in the \"lifting\" of the graphene layer and in its decoupling from the metal substrate. The oxygen adsorption below graphene proceeds as on clean Ir(111), giving only a slightly higher oxygen coverage. Upon lifting, the C 1s signal shows a downshift in binding energy, due to the charge transfer to graphene from the oxygen-covered metal surface. Moreover, the characteristic spectral signatures of the graphene-substrate interaction in the valence band are removed, and the spectrum of strongly hole-doped, quasi free-standing graphene with a single Dirac cone around the K? point is observed. The oxygen can be deintercalated by annealing, and this process takes place at around T = 600 K, in a rather abrupt way. A small amount of carbon atoms is lost, implying that graphene has been etched. After deintercalation graphene restores its interaction with the Ir(111) substrate. Additional intercalation/deintercalation cycles readily occur at lower oxygen doses and temperatures, consistently with an increasingly defective lattice. Our findings demonstrate that oxygen intercalation is an efficient method for fully decoupling an extended layer of graphene from a metal substrate, such as Ir(111). They pave the way for the fundamental research on graphene, where extended, ordered layers of free-standing graphene are important and, due to the stability of the intercalated system in a wide temperature range, also for the advancement of next-generation graphene-based electronics. (literal)

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