Abstract
Iron core–gold shell (Fe@Au) nanoparticles are prominent for their magnetic and optical properties, which are especially beneficial for biomedical uses. Some experiments were carried out to produce Fe@Au particles with a one-step synthesis method, Ultrasonic Spray Pyrolysis (USP), which is able to produce the particles in a continuous process. The Fe@Au particles were produced with USP from a precursor solution with dissolved Iron (III) chloride and Gold (III) chloride, with Fe/Au concentration ratios ranging from 0.1 to 4. The resulting products are larger Fe oxide particles (mostly maghemite Fe2O3), with mean sizes of about 260–390 nm, decorated with Au nanoparticles (AuNPs) with mean sizes of around 24–67 nm. The Fe oxide core particles are mostly spherical in all of the experiments, while the AuNPs become increasingly irregular and more heavily agglomerated with lower Fe/Au concentration ratios in the precursor solution. The resulting particle morphology from these experiments is caused by surface chemistry and particle to solvent interactions during particle formation inside the USP system.
Highlights
Iron oxide nanoparticles are one of the most commonly used magnetic nanoparticles [1]
The Fe oxide submicron particles decorated with Au nanoparticles (AuNPs) were produced with Ultrasonic Spray Pyrolysis (USP), using a precursor solution with dissolved iron (III) chloride and gold (III) chloride with different Fe/Au concentration ratios ranging from 0.1 to 4
It was presumed that a lower Fe/Au ratio would result in a more uniformly shaped coating on top of the Fe oxide particles [20], due to the higher Au content during particle formation
Summary
Iron oxide nanoparticles are one of the most commonly used magnetic nanoparticles [1]. Composite iron core–gold shell nanoparticles are researched widely for their broad uses in medical treatment [3,7], magnetic resonance imaging [8], cancer treatment [9] and drug delivery systems, as well as for catalysis, sensors, and so on [1,10,11,12], due to the coupling of magnetic and optical properties of iron and gold, when in nanoparticle form The combination of these properties makes these particles of interest for use in energy, solar cells and fuel cells [6].
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