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Effect of environment medium and the in situ formation of precursor on the composition-shape of iron oxide nanoparticles synthesized by thermal decomposition method

Abstract

In this work, we investigate the effect of reaction environment and of the in situ formation of iron precursor upon performing thermal decomposition to synthesize iron oxide nanoparticles (IONPs). Spherical IONPs with a spinel Fe3-xO4 structure were synthesized by thermal decomposition of (Fe)2 stearate assisted by oleic acid in octyl ether under air. In similar conditions and by adjusting only the reaction medium i.e under argon, core-shelled FeO@Fe3-xO4 NPs with the same sizes were obtained. On the other hand, the thermal decomposition of (Fe)3 oleate in the presence of a mixture of oleic acid and sodium oleate, under air and argon, lead to the formation of cubic-shaped NPs with FeO@Fe3-xO4 structure. Cubic NPs with homogenous composition of Fe3-xO4 were synthesized from an (Fe)3 oleate formed in situ from FeCl3·6H2O and sodium oleate, which was decomposed immediately. The composition and shape dependence from the experimental conditions, i.e. atmosphere and iron complex, was discussed. The synthesized NPs were characterized by combining several techniques including Transmission Electron Microscopy (TEM), Scanning-TEM, X-Ray Diffraction (XRD) and 57Fe Mössbauer spectrometry. The correlation between the crystalline composition and the magnetic properties were investigated by carrying out magnetization measurements as function of applied field and of temperature. The spherical and cubic-shaped NPs with a core-shell structure displays an exchange bias coupling due to the interaction between the antiferromagnetic (AFM) core and the ferrimagnetic (FiM) layer at the surface, while the Fe3-xO4 NPs exhibit a saturation magnetisation lower to the bulk counterpart due to the oxidation effects and the presence of spin canted layer at their surface.

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Publication details

The article was received on 25 May 2018, accepted on 02 Oct 2018 and first published on 02 Oct 2018


Article type: Paper
DOI: 10.1039/C8CE00875B
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Effect of environment medium and the in situ formation of precursor on the composition-shape of iron oxide nanoparticles synthesized by thermal decomposition method

    W. Baaziz, B. Pichon, J. Grenèche and S. Begin-Colin, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00875B

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