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Surface modification of Iron Oxide nanoparticles by the chemical and thermal treatment

Oleksandra Korovyanko 1Mykhailo Sytnyk 1Tetyana Provalska 1Yuriy Khalavka 2Petro Feychuk 1

1. Department of Inorganic Chemistry, Chernivtsi National University, Kotziubynskoho str. 2, Chernivtsi 58012, Ukraine
2. Johannes Gutenberg Universität, Institut für Physikalische Chemie, Jakob Welder Weg, 11, Mainz 55128, Germany


Iron oxide nanoparticles can be synthesized by sol-gel technique [1] in aqueous media or in organic solvents. It was obtained that the nanoparticles’ properties strong depend on their surface characteristics. The aim of a present report was to investigate influence of heat treatment of the iron oxides nanoparticles aqueous solutions on their structure and physical properties.
Magnetite Fe3O4 nanoparticles were synthesized by co-precipitation from 0,01 M Fe2+ and 0,02 M Fe3+ solutions, added to ammonium hydroxide and stabilized by oleic acid. The obtained solutions were heated in 50-100oC range during 1 -10 h.
It was shown that the nanoparticles of magemite and magnetite can be obtained by this method varying amount of the precursors. Increasing amount of stabilizer, leads to decreasing of magnetic susceptibility of the nanoparticles. Prolonged heat treatment result in the nanoparticles growth and forming of spherical agregates with size about 40-50 nm. The TEM analysis showed that iron oxide nanoparticles sizes can be regulated in 5-50 nm range by the amount of stabilizer. Magnetic properties of obtained solutions were investigated by the depth of solution meniscus in electromagnetic field. Peaks, at 1050 nm, were observed in the infrared absorption spectra of magnetite due charge transfer transitions Fe2+- Fe3+ are in agreement with [2], where synthesis based on the decomposition of presynthesized iron oleate was used.


1. Berger, P.; Adelman, N. B.; Beckman, K. J.; Campbell, D. J.; Ellis, A. B.; Lisensky, G. C. Journal of Chemical Education 1999, 76, 943-8.

2. Park, J.; An, K.; Hwang, Y.; Park, J.-G.; Noh, H.-J.; Kim, J.-Y.; Park, J.-H.; Hwang, N.-M.; Hyeon, T. Nature Mater. 2004, 3, 891-895.


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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Mykhailo Sytnyk
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-31 14:32
Revised:   2009-06-07 00:44