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High resolution electron energy loss spectroscopy of manganese oxides: application to Mn3O4 nanoparticles

Laffont-Dantras, Lydia and Gibot, Pierre High resolution electron energy loss spectroscopy of manganese oxides: application to Mn3O4 nanoparticles. (2010) Materials Characterization, vol. 61 (n° 11). pp. 1268-1273. ISSN 1044-5803

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Official URL: http://dx.doi.org/10.1016/j.matchar.2010.09.001

Abstract

Manganese oxides particularly Mn3O4 Hausmannite are currently used in many industrial applications such as catalysis, magnetism, electrochemistry or air contamination. The downsizing of the particle size of such material permits an improvement of its intrinsic properties and a consequent increase in its performances compared to a classical micron-sized material. Here, we report a novel synthesis of hydrophilic nano-sized Mn3O4, a bivalent oxide, for which a precise characterization is necessary and for which the determination of the valency proves to be essential. X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and particularly High Resolution Electron Energy Loss Spectroscopy (HREELS) allow us to perform these measurements on the nanometer scale. Well crystallized 10–20 nm sized Mn3O4 particles with sphere-shaped morphology were thus successfully synthesized. Meticulous EELS investigations allowed the determination of a Mn3+/Mn2+ ratio of 1.5, i.e. slightly lower than the theoretical value of 2 for the bulk Hausmannite manganese oxide. This result emphasizes the presence of vacancies on the tetrahedral sites in the structure of the as-synthesized nanomaterial.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Materials Characterization website : http://www.sciencedirect.com/science/journal/10445803
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université de Picardie Jules Verne (FRANCE)
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Deposited By: Leila Abdelouhab
Deposited On:17 May 2011 13:19

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