24 March 2014 Impact of solvent mixture on iron nanoparticles generated by laser ablation
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Abstract
The present work reveals the structural and magnetic properties of iron oxide (FexOy) nanoparticles (NPs) prepared by femtosecond laser ablation. The FexOy-NPs were produced in solutions consisting of different ratios of water and acetone. Laser ablation in water yields agglomerates and that in acetone yields chain structures whereas that in water/acetone show a mixture of both. We observe significant fabrication dependent properties such as different crystallinities and magnetic behaviors. The structural characterization shows a change from iron (Fe) to a FexOy state of the NPs which depends on the solution composition. Furthermore, transmission electron microscopy measurements exhibit a broad particle size distribution in all samples but with significant differences in the mean sizes. Using magnetic measurements we show that nanoparticles fabricated in pure acetone have lower coercive fields which come along with a smaller mean particle size and therefore increasing superparamagnetic behavior.
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M. Chakif, O. Prymak, M. Slota, E. Heintze, E. L. Gurevich, C. Esen, L. Bogani, M. Epple, A. Ostendorf, "Impact of solvent mixture on iron nanoparticles generated by laser ablation", Proc. SPIE 8955, Colloidal Nanoparticles for Biomedical Applications IX, 895507 (24 March 2014); doi: 10.1117/12.2037682; https://doi.org/10.1117/12.2037682
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