Abstract

Metal nanoparticles have been attracting intensive interest because of potential applications in the areas of magnetism, electronics, etc. In this paper, Fe and Pt nanoparticles were first synthesized by decomposition of FeCl₂.4H₂O and reduction of Pt(acac)₂, respectively with 1,2-hexadecanediol and LiBEt3H superhydride as the reducing reagent at high temperature in polyol process. Similarly, FePt nanoparticles were fabricated by Fe and Pt precursors in the presence of oleic acid, oleylamine and 1,2-hexadecanediol at 200°C, followed by refluxing at 250°C. Transmission electron microscopy (TEM) images showed that self-assembled 7 nm Fe nanoparticles are formed as polygon with good size distribution and closed to each other because of magnetic interactions dominance, whereas shapeless 2 to 6 nm Pt nanoparticles have broad size distribution about 18%. On the other hand, 4 nm iron-platinum (FePt) nanoparticles have dot shape with standard division about 10% in the same condition. The results of energy-dispersive X-ray spectroscopy (EDS) analysis indicated that the composition of FePt nanoparticles gives Fe₅₂Pt₄₈ stoichiometery. The X-ray diffraction (XRD) spectrums show that the structure of FePt nanocomposites change from face-centred-cubic (FCC) to face-centered tetragonal (FCT) phase by annealing process.

Key words: Reducing agent, iron-platinum (FePt) nanoparticles, equilibrium interactions, polyol method.