Chemically synthesized FePt nanoparticles with controlled particle size, shape and composition.

Monodisperse Fe-Pt nanoparticles have been prepared by thermal decomposition of iron pentacarbonyl [Fe(CO)5] and reduction of platinum acetylacetonate [Pt(acac)2] with dibenzyl ether in the presence of oleic acid and oleyl amine. The particle composition was adjusted by changing the Fe(CO)5/Pt(acac)2 molar ratio while fixing the Pt(acac)2 amount. The size of FePt nanoparticles was tuned by controlling the injection temperature of the iron precursor.