Abstract
In this study the mechanism for the formation of FePt nanoparticles (NPs) via the pyrolysis of iron(III) ethoxide [Fe(OEt)3] and platinum(II) acetylacetonate [Pt(acac)2] is investigated. We have recently reported that monodispersed equiatomic FePt NPs with a mean diameter of 4.5 nm and a narrow composition distribution were successfully synthesized by this route. However, control of the mean size and further narrowing of the size distribution have not yet been achieved. In the present study, we systematically examined variability in the particle size Dp, size distribution σ, and atomic composition of the NPs with changing synthetic conditions such as reaction temperature, rate of temperature increase, and total amounts and input molar ratios of precursors and capping agents. As a result, Dp was varied from 1.8 to 6.8 nm, the best size distribution σ achieved was 16%, and the Fe content of the NPs varied from 29 to 51 atomic %. On the basis of the experimental results, we determined the following important...
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