Journal
MATERIALS
Volume 12, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/ma12203326
Keywords
Ultrasonic Spray Pyrolysis; core-shell nanostructures; Fe@Au; iron oxide particles; Au nanoparticles; nanoparticle morphology
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Funding
- Slovenian Research Agency [P2-0120, P2-0132, BI-DE/17-19-12]
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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.
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