Beginning from spindle α-Fe2O3, monodisperse α-Fe2O3@SiO2 ellipsoids with different shell thicknesses were prepared by the Stöber method using tetraethyl orthosilicate (TEOS) as the precursor. Subsequently, the monodisperse γ-Fe2O3@SiO2 ellipsoids were fabricated by reduction–oxidation treatments under H2/O2 atmospheres. The SiO2 shell thickness could be easily controlled by changing the amounts of TEOS. Their structures and optical properties were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. The hysteresis loops of these nanoparticles were comparatively investigated. Furthermore, the relationships of the magnetic parameters and shell thicknesses were analysed in depth.
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Zhang et al. (2014) studied this question.
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