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Preparation of iron oxide nanocrystals by surfactant-free or oleic acid-assisted thermal decomposition of a Fe(III) alkoxide
Stockholm University, Sweden.
SLU Swedish University of Agricultural Sciences, Sweden.
Uppsala University, Sweden.
Uppsala University, Sweden.
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2008 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 320, p. 781-787Article in journal (Refereed) Published
Abstract [en]

A new non-hydrolytic, alkoxide-based route was developed to synthesize iron oxide nanocrystals. Surfactant-free thermal decomposition of the iron 2-methoxy-ethoxide precursors results in the formation of uniform iron oxide nanocrystals with an average size of 5.6 nm. Transmission electron microscope study shows that the nanocrystals are protected against aggregation by a repulsive surface layer, probably originating from the alkoxy-alkoxide ligands. Addition of oleic acid resulted in monodisperse nanocrystals with an average size of 4 nm. Mössbauer analysis confirmed that the nanocrystals mainly consisted of maghemite. Analysis of the magnetic hysteresis loop measurements and the zero field and field cooled measurements displayed an excellent fit to established theories for single-domain superparamagnetic nanocrystals and the size of the magnetic domains correlated well to the crystallite size obtained from transmission electron microscope.

Place, publisher, year, edition, pages
2008. Vol. 320, p. 781-787
Keywords [en]
magnetic nanoparticles
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:ri:diva-32134DOI: 10.1016/j.jmmm.2007.08.018Scopus ID: 2-s2.0-39049090466OAI: oai:DiVA.org:ri-32134DiVA, id: diva2:1151993
Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2019-10-10Bibliographically approved

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