Spectroscopic and magnetic studies of highly dispersible superparamagnetic silica coated magnetite nanoparticles

Rok publikacji: 2017
Wydawca:  Journal of Magnetism and Magnetic Materials, 2017, 433, 254-261
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K. Tadyszak, A. Kertmen, L. E. Coy, R. Andruszkiewicz, S. Milewski, I. Kardava, B. Scheibe, S. Jurga, K. Chybczyńska
Superparamagnetic behavior in aqueously well dispersible magnetite core-shell Fe3O4@SiO2 nanoparticles is presented. The magnetic properties of core-shell nanoparticles were measured with use of the DC, AC magnetometry and EPR spectroscopy. Particles where characterized by HR-TEM and Raman spectroscopy, showing a crystalline magnetic core of 11.5 ± 0.12 nm and an amorphous silica shell of 22 ± 1.5 nm in thickness. The DC, AC magnetic measurements confirmed the superparamagnetic nature of nanoparticles, additionally the EPR studies performed at much higher frequency than DC, AC magnetometry (9 GHz) have confirmed the paramagnetic nature of the nanoparticles. Our results show the excellent magnetic behavior of the particles with a clear magnetite structure, which are desirable properties for environmental remediation and biomedical applications.

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