Composition distributions in FePt(Au) nanoparticles
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Ternary alloy FePt(Au) nanoparticles were prepared by the co-reduction of platinum(II) acetylacetonate and gold(III) acetate and the thermal decomposition of iron pentacarbonyl in hot phenyl ether in the presence of oleic acid and oleylamine ligands. This gave spherical particles with an average diameter of 4.4 nm with a range of diameters from approximately 1.6–9 nm. The as-synthesized particles had a solid solution, face-centered-cubic structure. Though the average composition of the particles was Fe44Pt45Au11, individual particle analysis by Scanning Transmission Electron Microscopy–X-ray Energy Dispersive Spectroscopy showed a broad distribution in composition. In general, smaller-sized particles tended to have a lower amount of Au as compared to larger-sized particles. As the Au content increased, the ratio of Fe/Pt widened.
KeywordsFePt Nanoparticles Compositional distributions Synthesis
The authors gratefully acknowledge the National Science Foundation Materials Research Science and Engineering Center (DMR-0213985) for supporting this work as well as the University of Alabama Materials Science graduate fellowship program. The Tecnai TEM was acquired through the National Science Foundation Major Instrumentation Program (DMR-0421376). The authors thank Professor John Chapman of the University of Glasgow, Scotland, for helpful discussions.
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