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The characterization of Co-nanoparticles supported on graphene

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Title
The characterization of Co-nanoparticles supported on graphene
Author(s)
P. Bazylewski; D. W. Boukhvalov; A. I. Kukharenko; E. Z. Kurmaev; A. Hunt; A. Moewes; Y. H. Lee; S. O. Cholakh; G. S. Chang
Publication Date
2015-09
Journal
RSC ADVANCES, v.5, no.92, pp.75600 - 75606
Publisher
ROYAL SOC CHEMISTRY
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. © This journal is The Royal Society of Chemistry 2015
URI
https://pr.ibs.re.kr/handle/8788114/2154
ISSN
2046-2069
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Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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