Abstract
We report, for the first time, the synthesis of magnetically contrasted oxide-based core–shell nanoparticles using the polyol process. Iron oxide nanoparticles were first prepared by forced hydrolysis of iron acetate salt in a polyol and were then recovered by centrifugation and re-dispersed in a fresh cobalt acetate polyol solution. The microstructure of the resulting powder was finely characterized combining X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. Interestingly, the produced particles appeared to be of a very high crystalline quality with a perfect epitaxy between the spinel-like iron oxide core and the rock-salt-like cobalt monoxide shell, leading to a substantial exchange bias at low temperatures. As a consequence, a net blocking temperature, T B, increase was measured on the superparamagnetic iron oxide cores when they were coated by CoO, reaching a T B value of 298 K, very close to room temperature.
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Acknowledgments
The authors thank Dr. Philippe Decorse (Univ. Paris Diderot) and Dr. Y. Klein (Univ. Pierre & Marie Curie) for their technical XPS and PPMS assistance and fruitful discussions. This work was supported by ANR-CONACyT research program (MINAFC).
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Gaudisson, T., Ourry, L., Hammoud, H. et al. Exchange-biased oxide-based core–shell nanoparticles produced by seed-mediated growth in polyol. J Nanopart Res 16, 2359 (2014). https://doi.org/10.1007/s11051-014-2359-5
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DOI: https://doi.org/10.1007/s11051-014-2359-5