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Publication Citation: Stable Single-Crystalline Body Centered Cubic Fe Nanoparticles

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Author(s): Natalie F. Huls; Lise-Marie Lacroix; Don Ho; Xiaolian Sun; Shouheng Sun;
Title: Stable Single-Crystalline Body Centered Cubic Fe Nanoparticles
Published: April 20, 2011
Abstract: Air stable magnetic nanoparticles (MNPs) with high magnetization are required in order to fully realize optimized biomedical agents. However, only metallic NPs with good crystallinity such as Fe or FeCo, exhibit magnetization as high as 220 A.m.kg. Their synthesis and further stabilization are very challenging tasks which have been partially achieved by multiple steps processes. The synthesis of the crystalline core, based on high temperature thermodecomposition, an annealing step, or reduction under H_{2}, has to be followed by a secondary shell growth consisting of carbon, oxides or noble metal. Here, we report the first direct preparation of air stable single crystalline bcc Fe MNPs by thermodecomposition under mild conditions. These highly crystalline Fe MNPs are embedded in a native iron oxide shell which stabilizes them against further oxidation. These crystalline Fe/Fe_{3}O_{4} MNPs can be easily stabilized in acqueous media and present magnetic properties suitable for magnetic resonant imaging (MRI) and magnetic field hyperthermia (MFH) applications.
Citation: Nano Letters
Volume: 11
Pages: pp. 1641 - 1645
Keywords: Fe nanoparticles, magnetic field hyperthermia, magnetic nanoparticles, MRI contrast enhancement, nanoparticle synthesis
Research Areas: Nanomaterials
PDF version: PDF Document Click here to retrieve PDF version of paper (2MB)