Journal
APPLIED SURFACE SCIENCE
Volume 428, Issue -, Pages 775-780Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.09.194
Keywords
Graphene; Adsorption; Carbon monoxide; Vibrational spectroscopy; XPS
Categories
Funding
- PRIN [GRAF 20105ZZTSE_003]
- FIRB Futuro in Ricerca from Ministero Universita e Ricerca (MIUR) [RBFR128BEC_004]
- University of Genova
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The chemical reactivity of single layers of supported graphene (G) is affected by the nature of the underlying substrate: in particular CO chemisorption occurs on G/Ni(111), while graphene on Cu is inert. Here, we demonstrate experimentally that doping of the G layer with nitrogen atoms further increases the reactivity of the G/Ni( 111) system towards CO. The doped layer is obtained by sputtering pristine G/Ni(111) with N-2(+) ions. For an similar to 11% dopant concentration, an additional electron energy loss at 238 meV appears in the HREEL spectra besides the loss around 256 meV present also on pristine G/Ni(111). The new feature corresponds to a CO species with a higher desorption temperature and, consequently, a higher adsorption energy than the one forming on pristine G/Ni( 111). At low coverage, the adsorption energy is estimated to be 0.85 eV/molecule. (C) 2017 Elsevier B.V. All rights reserved.
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