Direct Synthesis of Water-Dispersible FePt Nanoparticles Capped with L-Cysteine
Abstract:A direct synthetic route of FePt nanoparticles (NPs) has been developed. Reduction of platinum acethylacetonate (Pt(acac)2) and thermal decomposition of iron carbonyl (Fe(CO)5) in the presence of L-cysteine produced fcc FePt NPs with a mean diameter of 2.9 nm. Capping of the FePt NPs with L-cysteine is accomplished by a thiolate linkage between the amino acid and the NP surfaces, which renders them water-dispersible rather than in organic solvents. SQUID magnetization study demonstrated that the FePt NPs exhibited superparamagnetic behavior at 300 K. For the structural model of the FePt NPs, the Fe K-edge and Pt LIII-edge XAFS results suggest that most of the Pt atoms are preferentially located in the core region, the Fe atoms are preferentially located in the shell region.
Document Type: Research Article
Publication date: 2010-01-01
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