Synthesis of Highly Crystalline and Monodisperse Maghemite Nanocrystallites without a Size-Selection Process

The synthesis of highly crystalline and monodisperse γ-Fe2O3 nanocrystallites is reported. High-temperature (300 °C) aging of iron−oleic acid metal complex, which was prepared by the thermal decomposition of iron pentacarbonyl in the presence of oleic acid at 100 °C, was found to generate monodisper...

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Published inJournal of the American Chemical Society Vol. 123; no. 51; pp. 12798 - 12801
Main Authors Hyeon, Taeghwan, Lee, Su Seong, Park, Jongnam, Chung, Yunhee, Na, Hyon Bin
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 26.12.2001
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Summary:The synthesis of highly crystalline and monodisperse γ-Fe2O3 nanocrystallites is reported. High-temperature (300 °C) aging of iron−oleic acid metal complex, which was prepared by the thermal decomposition of iron pentacarbonyl in the presence of oleic acid at 100 °C, was found to generate monodisperse iron nanoparticles. The resulting iron nanoparticles were transformed to monodisperse γ-Fe2O3 nanocrystallites by controlled oxidation by using trimethylamine oxide as a mild oxidant. Particle size can be varied from 4 to 16 nm by controlling the experimental parameters. Transmission electron microscopic images of the particles showed 2-dimensional and 3-dimensional assembly of particles, demonstrating the uniformity of these nanoparticles. Electron diffraction, X-ray diffraction, and high-resolution transmission electron microscopic (TEM) images of the nanoparticles showed the highly crystalline nature of the γ-Fe2O3 structures. Monodisperse γ-Fe2O3 nanocrystallites with a particle size of 13 nm also can be generated from the direct oxidation of iron pentacarbonyl in the presence of oleic acid with trimethylamine oxide as an oxidant.
Bibliography:ark:/67375/TPS-V1Z3WXF3-V
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ISSN:0002-7863
1520-5126
DOI:10.1021/ja016812s