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首页> 外文期刊>New Journal of Chemistry >Preparation and magnetic properties of γ-Fe2O3@SiO2 core shell ellipsoids with different aspect ratios
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Preparation and magnetic properties of γ-Fe2O3@SiO2 core shell ellipsoids with different aspect ratios

机译：纵横比不同的γ-Fe2O3@ SiO2核壳椭球的制备及磁性

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摘要

Beginning from spindle α-Fe2O3, monodisperse α-Fe2O3@SiO2 ellipsoids with different shell thicknesses were prepared by the Stober 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.
机译：从纺锤体α-Fe2O3开始，使用原硅酸四乙酯（TEOS）作为前体，通过斯托伯法制备了具有不同壳厚的单分散α-Fe2O3@ SiO2椭球体。随后，在H2 / O2气氛下通过还原氧化处理制备了单分散的γ-Fe2O3@ SiO2椭球。通过改变TEOS的量可以容易地控制SiO 2壳的厚度。通过透射电子显微镜（TEM），X射线衍射（XRD）和拉曼光谱对它们的结构和光学性质进行了表征。对这些纳米颗粒的磁滞回线进行了比较研究。此外，深入分析了磁参数与壳厚度的关系。

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