The effect of preparation conditions on magnetite nanoparticles obtained via chemical co-precipitation

Z. Klencsár, Attila Ábrahám, László Szabó, Ervin Gy Szabó, Sándor Stichleutner, E. Kuzmann, Z. Homonnay, Gyula Tolnai

Research output: Contribution to journalArticle

Abstract

Chemical stability and good biocompatibility under physiological conditions render nanoparticles made of the spinel oxide magnetite a favorable choice in biomedical diagnostic and therapeutic applications that benefit from high levels of magnetization and superparamagnetism. Under ambient atmosphere, however, magnetite nanoparticles are prone to undesired oxidation leading to an at least partially oxidized form of magnetite. In the present work Fe3-xO4 nanopowders (with a particle size of 10–50 nm) were prepared under different conditions via chemical co-precipitation method, resulting in samples with different oxidation levels. The effect of oxidation of the prepared samples on their morphological, structural, electronic and magnetic properties is followed, respectively, by the means of transmission electron microscopy (TEM), powder X-ray diffractometry (PXRD), 57Fe Mössbauer spectroscopy (MS) and electron magnetic resonance (EMR) spectroscopy measurements. A novel method is applied to decompose the heavily broadened room-temperature 57Fe Mössbauer spectra of the nanoparticles into signals of intermediate valence Fe2.5+ and that of Fe3+ iron species. The results indicate that the cubic lattice parameter of non-stoichiometric magnetite nanoparticles depends on the concentration as well as on the mean oxidation level of the intermediate valence iron species. At the same time, EMR spectra of the samples indicate that oxidation influences the magnetic anisotropy of the nanoparticles, with the magnitude of the nanoparticles’ magnetic anisotropy field being correlated with the concentration of the intermediate valence iron species. Malic acid, used as coating agent for several of the samples, is shown to hinder the oxidation of magnetite nanoparticles.

Original languageEnglish
Pages (from-to)122-132
Number of pages11
JournalMaterials Chemistry and Physics
Volume223
DOIs
Publication statusPublished - Feb 1 2019

Fingerprint

Magnetite Nanoparticles
Magnetite nanoparticles
Coprecipitation
magnetite
Oxidation
nanoparticles
preparation
oxidation
Electron resonance
Ferrosoferric Oxide
Nanoparticles
Iron
Magnetic anisotropy
Magnetite
valence
iron
Superparamagnetism
Magnetic resonance spectroscopy
Electron spectroscopy
Chemical stability

Keywords

  • Electron magnetic resonance
  • Hyperfine interactions
  • Magnetite
  • Mössbauer spectroscopy
  • Nanoparticles

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

The effect of preparation conditions on magnetite nanoparticles obtained via chemical co-precipitation. / Klencsár, Z.; Ábrahám, Attila; Szabó, László; Szabó, Ervin Gy; Stichleutner, Sándor; Kuzmann, E.; Homonnay, Z.; Tolnai, Gyula.

In: Materials Chemistry and Physics, Vol. 223, 01.02.2019, p. 122-132.

Research output: Contribution to journalArticle

Klencsár, Z. ; Ábrahám, Attila ; Szabó, László ; Szabó, Ervin Gy ; Stichleutner, Sándor ; Kuzmann, E. ; Homonnay, Z. ; Tolnai, Gyula. / The effect of preparation conditions on magnetite nanoparticles obtained via chemical co-precipitation. In: Materials Chemistry and Physics. 2019 ; Vol. 223. pp. 122-132.
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AB - Chemical stability and good biocompatibility under physiological conditions render nanoparticles made of the spinel oxide magnetite a favorable choice in biomedical diagnostic and therapeutic applications that benefit from high levels of magnetization and superparamagnetism. Under ambient atmosphere, however, magnetite nanoparticles are prone to undesired oxidation leading to an at least partially oxidized form of magnetite. In the present work Fe3-xO4 nanopowders (with a particle size of 10–50 nm) were prepared under different conditions via chemical co-precipitation method, resulting in samples with different oxidation levels. The effect of oxidation of the prepared samples on their morphological, structural, electronic and magnetic properties is followed, respectively, by the means of transmission electron microscopy (TEM), powder X-ray diffractometry (PXRD), 57Fe Mössbauer spectroscopy (MS) and electron magnetic resonance (EMR) spectroscopy measurements. A novel method is applied to decompose the heavily broadened room-temperature 57Fe Mössbauer spectra of the nanoparticles into signals of intermediate valence Fe2.5+ and that of Fe3+ iron species. The results indicate that the cubic lattice parameter of non-stoichiometric magnetite nanoparticles depends on the concentration as well as on the mean oxidation level of the intermediate valence iron species. At the same time, EMR spectra of the samples indicate that oxidation influences the magnetic anisotropy of the nanoparticles, with the magnitude of the nanoparticles’ magnetic anisotropy field being correlated with the concentration of the intermediate valence iron species. Malic acid, used as coating agent for several of the samples, is shown to hinder the oxidation of magnetite nanoparticles.

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