The characterization of Co-nanoparticles supported on graphene / Bazylewski P.,Boukhvalov D. W.,Kukharenko A. I.,Kurmaev E. Z.,Hunt A.,Moewes A.,Lee Y. H.,Cholakh S. O.,Chang G. S. // RSC ADVANCES. - 2015. - V. 5, l. 92. - P. 75600-75606.

ISSN/EISSN:

2046-2069 / нет данных

Type:

Article

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.

Author keywords:

OXYGEN REDUCTION; ELECTRONIC-STRUCTURE; OXIDE; ELECTROCATALYSTS; PHOTOELECTRON; SPECTROSCOPY; SYSTEMS; MEDIA

DOI:

10.1039/c5ra12893e

Web of Science ID:

ISI:000361120000075

Соавторы в МНС:

Другие поля

Поле	Значение
Publisher	ROYAL SOC CHEMISTRY
Address	THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Language	English
Keywords-Plus	OXYGEN REDUCTION; ELECTRONIC-STRUCTURE; OXIDE; ELECTROCATALYSTS; PHOTOELECTRON; SPECTROSCOPY; SYSTEMS; MEDIA
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Multidisciplinary
Author-Email	gapsoo.chang@usask.ca
ResearcherID-Numbers	Lee, Young Hee/A-5424-2013 Boukhvalov, Danil/F-7517-2017 Kukharenko, Andrey/M-8256-2016 Cholakh, Seif/M-8221-2016 Kurmaev, Ernst/J-4254-2013
ORCID-Numbers	Kukharenko, Andrey/0000-0003-3774-6909 Cholakh, Seif/0000-0002-9313-6614 Kurmaev, Ernst/0000-0003-4625-4930
Funding-Acknowledgement	Russian Scientific Foundation for Basic Research {[}14-02-00006]; Ministry of Education and Science of the Russian Federation {[}N 16.1751.2014/K]; Natural Sciences and Engineering Research Council of Canada (NSERC); Canada Foundation for Innovation (CFI); NSERC; Canada Research Chair program
Funding-Text	The XPS measurements were supported by Russian Scientific Foundation for Basic Research (Project 14-02-00006). D. W. B. acknowledges support of DFT calculations from the Ministry of Education and Science of the Russian Federation, Project N 16.1751.2014/K. G. S. Chang gratefully acknowledges support from the Natural Sciences and Engineering Research Council of Canada (NSERC) and Canada Foundation for Innovation (CFI). A. Moewes acknowledges funding from NSERC and the Canada Research Chair program.
Number-of-Cited-References	25
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	16
Journal-ISO	RSC Adv.
Doc-Delivery-Number	CR1YA