Synthesis of FePt3 nanoparticles using PtCl2 and Fe(acac)3: Study of the surfactant effect, magnetism and electro-activity
25 Jun 2015-Journal of Physics C: Solid State Physics (AIP Publishing LLCAIP Publishing)-Vol. 1665, Iss: 1, pp 050057
TL;DR: In this article, different phases of Fe-Pt and their magnetic behaviors were examined by changing the concentration of precursors, reducing agent and surfactants and the use of excess surfactant and reducing agents was found to effect the nucleation and growth of the Fe-pt nanoparticle formation.
Abstract: Monodisperse FePt3 nanoparticles have been prepared using organic precursor of Fe (Fe(acac3)) and inorganic precursor of Pt (PtCl2) by adopting hot injection methods using polyol process. By changing the concentration of precursors, reducing agent and surfactants, we examine different reaction products e.g. different phases of Fe-Pt and their magnetic behaviors. The use of excess surfactant and reducing agents was found to effect the nucleation and growth of the Fe-Pt nanoparticle formation. The Pt rich phases of Fe-Pt show very good electro-active response toward redox reaction of ferro-ferri couple electrolyte which was analyzed using cyclic-voltammetry.
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TL;DR: By changing the total thickness of the bilayers while keeping the Pt/(Pt+Fe) atomic ratio constant, the size of the resulting bimetallic nanoparticles can be tuned, as confirmed by scanning electron microscopic measurements.
Abstract: We report the phase and size-controlled synthesis of Fe-Pt nanoalloys, prepared via a two-step synthesis procedure. The first step is the deposition of bilayers consisting of iron oxide and Pt films of desired thicknesses using atomic layer deposition, followed by a temperature-programmed reduction treatment of the film under H-2/N-2 atmosphere. This method enables the phase pure synthesis of all three Fe-Pt alloy phases, namely Fe3Pt, FePt, and FePt3, as revealed by in situ x-ray diffraction and x-ray fluorescence measurements. It is also demonstrated that by changing the total thickness of the bilayers while keeping the Pt/(Pt + Fe) atomic ratio constant, the size of the resulting bimetallic nanoparticles can be tuned, as confirmed by scanning electron microscopic measurements.
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