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The characterization of Co-nanoparticles supported on graphene

Title
The characterization of Co-nanoparticles supported on graphene
Author
Bukhvalov, Danil
Keywords
OXYGEN REDUCTION; ELECTRONIC-STRUCTURE; OXIDE; ELECTROCATALYSTS; PHOTOELECTRON; SPECTROSCOPY; SYSTEMS; MEDIA
Issue Date
2015-10
Publisher
ROYAL SOC CHEMISTRY
Citation
RSC ADVANCES, v. 5, NO 92, Page. 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.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2015/RA/C5RA12893E#!divAbstracthttp://hdl.handle.net/20.500.11754/28236
ISSN
2046-2069
DOI
10.1039/c5ra12893e
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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