Intercalation and reactions of CO under single layer graphene/Ni(111): the role of vacancies.

Autor:	Davì R; DCCI, Università degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy.; IMEM-CNR, UOS di Genova, Via Dodecaneso 33, 16146 Genova, Italy., Carraro G; IMEM-CNR, UOS di Genova, Via Dodecaneso 33, 16146 Genova, Italy., Stojkovska M; DCCI, Università degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy.; IMEM-CNR, UOS di Genova, Via Dodecaneso 33, 16146 Genova, Italy., Smerieri M; IMEM-CNR, UOS di Genova, Via Dodecaneso 33, 16146 Genova, Italy., Savio L; IMEM-CNR, UOS di Genova, Via Dodecaneso 33, 16146 Genova, Italy., Gallet JJ; Sorbonne Université, CNRS, Laboratoire de Chimie Physique Matière et Rayonnement, UMR 7614, Campus Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France.; Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, F-91192 Gif-sur-Yvette, France., Bournel F; Sorbonne Université, CNRS, Laboratoire de Chimie Physique Matière et Rayonnement, UMR 7614, Campus Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France.; Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, F-91192 Gif-sur-Yvette, France., Rocca M; DIFI, Università degli Studi di Genova, Via Dodecaneso 33, 16146 Genova, Italy. vattuone@fisica.unige.it.; IMEM-CNR, UOS di Genova, Via Dodecaneso 33, 16146 Genova, Italy., Vattuone L; DIFI, Università degli Studi di Genova, Via Dodecaneso 33, 16146 Genova, Italy. vattuone@fisica.unige.it.; IMEM-CNR, UOS di Genova, Via Dodecaneso 33, 16146 Genova, Italy.
Jazyk:	angličtina
Zdroj:	Physical chemistry chemical physics : PCCP [Phys Chem Chem Phys] 2022 Nov 30; Vol. 24 (46), pp. 28486-28494. Date of Electronic Publication: 2022 Nov 30.
DOI:	10.1039/d2cp03441g
Abstrakt:	We use synchrotron radiation-induced core level photoemission spectroscopy to investigate the influence of vacancies, produced by ion bombardment, on monolayer graphene/Ni(111) exposed to CO at pressures ranging from ultra-high vacuum (10 -10 mbar) up to near ambient (5.6 mbar) conditions. CO intercalates at a rate which is comparable to the one observed in absence of defects and reacts via the Boudouard reaction producing additional carbon atoms and CO 2 . While the former attach to the graphene layer and extend it over areas previously covered by carbide, the CO 2 molecules bind to the graphene vacancies forming epoxy-like bonds across them, thus mending the defects. The so-formed complexes give rise to a peak at 533.4 eV which persists upon evacuating the vacuum chamber at room temperature and which we assign to a covalently bonded species containing C and O.
Databáze:	MEDLINE
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