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| Home > Publications database > Size Control of Iron Oxide Nanoparticles Synthesized by Thermal Decomposition Methods |
| Journal Article | FZJ-2023-00217 |
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2022
Soc.
Washington, DC
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Please use a persistent id in citations: doi:10.1021/acs.jpcc.2c05380 doi:10.34734/FZJ-2023-00217
Abstract: The controlled synthesis of superparamagnetic iron oxide nanoparticles is crucial for a variety of biomedical applications. Among different synthesis routes thermal precursor decomposition methods are the most versatile, yielding monodisperse nanoparticles on the multi-gram scale. Recent in situ kinetic studies of the nucleation and growth processes during thermal decomposition routes revealed non-classical nucleation and growth paths involving amorphous precursor phases and aggregative growth steps. With the knowledge of this kinetic mechanism we systematically examined a range of different iron oxide heat-up synthesis routes to understand and conclude which methods allow good and reproducible size control over a range of relevant nanoparticle diameters. Using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS) for the characterization of the nanoparticle size distribution we find that a set of solvents (1-octadecene, trioctylamine, docosane) provides access to a temperature range between 300 – 370°C allowing to synthesize monodisperse nanoparticles in a size range of 5 – 24 nm on large scale. We confirm that a thermal pretreatment of the iron oxide precursor is essential to achieve reproducible size control. We find that each solvent provides access to a certain temperature range, within which the variation of temperature, heating rate or precursor concentration allows to reproducibly control the nanoparticle size.
Keyword(s): Chemical Reactions and Advanced Materials (1st) ; Chemistry (2nd)
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