Magnetic and mössbauer spectral study of core/shell structured Fe/Au nanoparticles

Sung Jin Cho, Ahmed M. Shahin, Gary J. Long, Joseph E. Davies, Kai Liu, Fernande Grandjean, Susan M. Kauzlarich

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Abstract

Fe/Au nanoparticles have been chemically synthesized through a reverse micelle reaction and investigated by both conventional and synchrotron-based X-ray diffraction and by magnetic and Mössbauer spectral studies. The powder X-ray diffraction patterns reveal both the presence of crystalline α-iron and gold and the absence of any crystalline iron oxides or other crystalline products. First-order reversal curves, along with the major hysteresis loops of the Fe/Au nanoparticles, have been measured as a function of time in order to investigate the evolution of their magnetic properties. The iron-57 Mössbauer spectra of both uncoated iron nanoparticles and the Fe/Au nanoparticles have been measured at 78 and 295 K and indicate that two major iron-containing components are present, namely, the expected α-iron and the unexpected amorphous Fe 1-xB x alloy; several poorly crystallized ordered iron(III) oxide components as well as paramagnetic iron(II) and iron(III) components are also observed. These results indicate that the Fe-core/Au-shell nanoparticles synthesized through reverse micelles are far more complex than had been believed.

Original languageEnglish (US)
Pages (from-to)960-967
Number of pages8
JournalChemistry of Materials
Volume18
Issue number4
DOIs
StatePublished - Feb 21 2006

Fingerprint

Iron
Nanoparticles
Iron oxides
Micelles
Crystalline materials
Hysteresis loops
Synchrotrons
Gold
Diffraction patterns
Magnetic properties
Powders
X ray diffraction
X rays
ferric oxide

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Cho, S. J., Shahin, A. M., Long, G. J., Davies, J. E., Liu, K., Grandjean, F., & Kauzlarich, S. M. (2006). Magnetic and mössbauer spectral study of core/shell structured Fe/Au nanoparticles. Chemistry of Materials, 18(4), 960-967. https://doi.org/10.1021/cm0522073

Magnetic and mössbauer spectral study of core/shell structured Fe/Au nanoparticles. / Cho, Sung Jin; Shahin, Ahmed M.; Long, Gary J.; Davies, Joseph E.; Liu, Kai; Grandjean, Fernande; Kauzlarich, Susan M.

In: Chemistry of Materials, Vol. 18, No. 4, 21.02.2006, p. 960-967.

Research output: Contribution to journalArticle

Cho, SJ, Shahin, AM, Long, GJ, Davies, JE, Liu, K, Grandjean, F & Kauzlarich, SM 2006, 'Magnetic and mössbauer spectral study of core/shell structured Fe/Au nanoparticles', Chemistry of Materials, vol. 18, no. 4, pp. 960-967. https://doi.org/10.1021/cm0522073
Cho SJ, Shahin AM, Long GJ, Davies JE, Liu K, Grandjean F et al. Magnetic and mössbauer spectral study of core/shell structured Fe/Au nanoparticles. Chemistry of Materials. 2006 Feb 21;18(4):960-967. https://doi.org/10.1021/cm0522073
Cho, Sung Jin ; Shahin, Ahmed M. ; Long, Gary J. ; Davies, Joseph E. ; Liu, Kai ; Grandjean, Fernande ; Kauzlarich, Susan M. / Magnetic and mössbauer spectral study of core/shell structured Fe/Au nanoparticles. In: Chemistry of Materials. 2006 ; Vol. 18, No. 4. pp. 960-967.
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