title: 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 L(III)-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.
authors.affiliation: Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
authors.forename: Kohsuke
authors.initials: K
authors.lastname: Mori
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Kondo
authors.forename: Hiromi
authors.initials: H
authors.lastname: Yamashita
mesh_terms: D003545:Cysteine / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D010984:Platinum / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D014867:Water; D010984:Platinum; D007501:Iron; D003545:Cysteine