AI Article Synopsis
- A new method has been developed for creating iron (Fe(0)) nanoparticles with adjustable sizes and shapes, achieving fine control over them.
- The process involves reacting tiny Fe(0) nanoparticles in mild conditions with palmitic acid and amine ligands, which allows the control of nucleation and growth separately.
- By varying the concentration of the acid, researchers were able to manipulate the size (7 to 20 nm) and shape (spheres, cubes, or stars) of the nanoparticles, with their findings supported by advanced techniques like TEM and Mössbauer spectroscopy.
Article Abstract
A novel approach for the synthesis of Fe(0) nanoparticles (NPs) with tunable sizes and shapes is reported. Ultrasmall Fe(0) NPs were reacted under mild conditions in the presence of a mixture of palmitic acid and amine ligands. These NPs acted not only as preformed seeds but also as an internal iron(II) source that was produced by the partial dissolution of the NPs by the acid. This fairly simple approach allows the strict separation of the nucleation and the growth steps. By changing the acid concentration, a fine tuning of the relative ratio between the remaining Fe(0) seeds and the iron(II) reservoir was achieved, giving access to both size (from 7 to 20 nm) and shape (spheres, cubes or stars) control. The partial dissolution of the ultrasmall Fe(0) NPs into iron(II) source and the successive growth was further studied by using combined TEM and Mössbauer spectroscopy. The successive corrosion, coalescence, and ripening observed could be understood in the framework of an environment-dependent growth model.
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| http://dx.doi.org/10.1002/cplu.201800665 | DOI Listing |
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