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Title: Distinguishing the core from the shell in MnOx/MnOy and FeOx/MnOx core/shell nanoparticles through quantitative electron energy loss spectroscopy (EELS) analysis
Author: Estradé Albiol, Sònia
Yedra Cardona, Lluís
López-Ortega, Alberto
Estrader i Bofarull, Marta
Salazar-Alvarez, German
Baró, M. D.
Nogués, Josep
Peiró Martínez, Francisca
Keywords: Nanopartícules
Espectroscòpia de pèrdua d'energia d'electrons
Electron energy loss spectroscopy
Issue Date: 16-Apr-2011
Publisher: Elsevier Ltd
Abstract: The structural and chemical characterization of inverted bi-magnetic MnO x(antiferromagnetic)/MnO y(ferrimagnetic) and FeO x(soft-ferrimagnetic)/MnO x(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 L 3/L 2 peak intensity ratio and the Mn L 3 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.
Note: Versió postprint del document publicat a:
It is part of: Micron, 2011, vol. 43, num. 1, p. 30-36
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ISSN: 0968-4328
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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