Issue 46, 2022

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

Abstract

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 CO2. While the former attach to the graphene layer and extend it over areas previously covered by carbide, the CO2 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.

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

Article information

Article type
Paper
Submitted
27 jul 2022
Accepted
13 nov 2022
First published
14 nov 2022
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2022,24, 28486-28494

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

R. Davì, G. Carraro, M. Stojkovska, M. Smerieri, L. Savio, J. Gallet, F. Bournel, M. Rocca and L. Vattuone, Phys. Chem. Chem. Phys., 2022, 24, 28486 DOI: 10.1039/D2CP03441G

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