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Distinguishing the core from the shell in MnOx/MnOy and FeOx/MnOx core/shell nanoparticles through quantitative electron energy loss spectroscopy (EELS) analysis
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2011 (English)In: Micron, ISSN 0968-4328, E-ISSN 1878-4291, Vol. 43, no 1, 30-36 p.Article in journal (Refereed) Published
Abstract [en]

The structural and chemical characterization of inverted bi-magnetic MnOx(antiferromagnetic)/MnOy(ferrimagnetic) and FeOx(soft-ferrimagnetic)/MnOx(hard-ferrimagnetic) core/shell nanoparticles has been carried out by means of scanning transmission electron microscopy with electron energy loss spectroscopy analysis, (S)TEM-EELS. Quantitative EELS was applied to assess the local composition of the nanoparticles by evaluating the local Mn oxidation state based on the Mn L3/L2 peak intensity ratio and the Mn L3 peak onset. The analysis allows to unambiguously distinguish the core from the shell and to determine the nature of the involved manganese oxides in both cases. The results evidence that the structure of the nanoparticles is, in fact, more complex than the one designed by the synthesis parameters.

Place, publisher, year, edition, pages
2011. Vol. 43, no 1, 30-36 p.
Keyword [en]
EELS, Mn-oxide, Fe-oxide, Core-shell, Nanoparticles
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-60856DOI: 10.1016/j.micron.2011.04.002ISI: 000298570100006OAI: diva2:436019
Available from: 2011-08-22 Created: 2011-08-22 Last updated: 2012-05-31Bibliographically approved

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Salazar-Alvarez, German
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Department of Materials and Environmental Chemistry (MMK)
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