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Infrared

Characterization of the Oxidation of Magnetite Nanoparticles during Their Synthesis by Different Structural Analysis Techniques

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Pages 173-183 | Received 03 Nov 2019, Accepted 24 Feb 2020, Published online: 05 Mar 2020
 

Abstract

Water colloidal solutions of iron oxide nanoparticles coated with tetramethylammonium hydroxide were synthesized by co-precipitation methods. Dimensional analyses were accomplished by transmission electron microscopy (TEM) and the crystalline features of nanoparticles were studied by means of X-ray diffraction (XRD). The iron oxide nanoparticle structure was characterized by the use of the attenuated total reflectance Fourier transform infrared (ATR-FTIR) and Raman spectroscopic techniques. For the nanoparticle samples prepared at higher temperatures during synthesis, the Raman spectra demonstrated that magnetic core of iron oxide nanoparticles is composed of a mixture of magnetite (Fe3O4) and maghemite (γ-Fe2O3) phases. We believe that the oxidation of magnetite to maghemite has been occurred during the preparation protocol of nanoparticles performed at higher temperature.

Acknowledgments

This research was partially supported by JINR-RO project 04-4-1121-2015/2020. We greatly thank Dr. Ana Maria Racu (Institute of Condensed Matter Physics, Technical University Braunschweig from Germany) for the collection of the Raman spectra.

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