Growth Mechanisms and Oxidation-Resistance of Gold-Coated Iron Nanoparticles.pdf

Growth Mechanisms and Oxidation-Resistance of Gold-Coated Iron Nanoparticles.pdf

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Growth Mechanisms and Oxidation-Resistance of Gold-Coated Iron Nanoparticles

1 Growth Mechanisms and Oxidation-Resistance of Gold- Coated Iron Nanoparticles Sung-Jin Cho1, Juan-Carlos Idrobo2, Justin Olamit2, Kai Liu2*, Nigel D. Browning3, 4, and Susan M. Kauzlarich1* 1Department of Chemistry, University of California, Davis, CA 95616 2Department of Physics, University of California, Davis, CA 95616 3Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616 4National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 Corresponding authors: kailiu@ucdavis; smkauzlarich@ucdavis.edu Abstract We report the chemical synthesis of Fe-core/Au-shell nanoparticles by a reverse micelle method, and the investigation of their growth mechanisms and oxidation-resistant characteristics. The core-shell structure and the presence of the Fe Au phases have been confirmed by transmission electron microscopy, energy dispersive spectroscopy, X- ray diffraction, M?ssbauer spectroscopy, and inductively coupled plasma techniques. Additionally, atomic-resolution Z-contrast imaging and electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope (STEM) have been used to study details of the growth processes. The Au-shell grows by nucleating on the Fe-core surface before coalescing. The magnetic moments of such nanoparticles, in the loose powder form, decrease over time due to oxidation. The less than ideal oxidation-resistance of the Au shell may have been caused by the rough Au surfaces. However, in the pressed pellet form, electrical transport measurements show that the particles are fairly stable, as the resistance of the pellet does not change appreciably over time. 2 Introduction Magnetic nanoparticles are of interest for a wide variety of applications; for technology, as magnetic seals, printing, recording,1-3 and for biology, as magnetic resonance imaging (MRI) agents,4, 5 cell tagging and sorting.6 In these areas of resear

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