Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102356
Title: The characterization of Co-nanoparticles supported on graphene
Authors: Bazylewski, P.
Boukhvalov, D. W.
Kukharenko, A. I.
Kurmaev, E. Z.
Hunt, A.
Moewes, A.
Lee, Y. H.
Cholakh, S. O.
Chang, G. S.
Issue Date: 2015
Publisher: Royal Society of Chemistry
Citation: The characterization of Co-nanoparticles supported on graphene / P. Bazylewski, D. W. Boukhvalov, A. I. Kukharenko, et al. — DOI 10.1039/c5ra12893e // RSC Advances. — 2015. — Vol. 5. — Iss. 92. — P. 75600-75606.
Abstract: The results of density functional theory calculations and measurements using X-ray photoelectron spectroscopy of Co-nanoparticles dispersed on graphene/Cu are presented. It is found that for low cobalt thickness (0.02-0.06 nm) the Co forms islands distributed non-homogeneously which are strongly oxidized under exposure to air to form cobalt oxides. At greater thicknesses up to 2 nm the upper Co-layers are similarly oxidized whereas the lower layers contacting the graphene remain metallic. The measurements indicate a Co2+ oxidation state with no evidence of a 3+ state appearing at any Co thickness, consistent with CoO and Co[OH]2. The results show that thicker Co (2 nm) coverage induces the formation of a protective oxide layer while providing the magnetic properties of Co nanoparticles. © The Royal Society of Chemistry 2015.
Keywords: COBALT
COBALT COMPOUNDS
DENSITY FUNCTIONAL THEORY
GRAPHENE
NANOMAGNETICS
NANOPARTICLES
OXIDATION
CO NANOPARTICLES
COBALT OXIDES
MAGNETIC PROPERTIES OF CO
OXIDATION STATE
PROTECTIVE OXIDE LAYERS
X RAY PHOTOELECTRON SPECTROSCOPY
URI: http://hdl.handle.net/10995/102356
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84941254138
PURE ID: 302063
036b0945-34e7-44b1-adeb-1a11c9589a3f
ISSN: 20462069
DOI: 10.1039/c5ra12893e
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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