Abstract
Monodisperse Fe 3 O 4 -SiO 2 nanocomposites with core-shell structures have been designed and synthesized successfully in an organic phase using a two-step synthetic strategy. The obtained materials were characterized in detail by X-ray diffraction, transmission electron microscopy, and a vibrating sample magnetometer. The analytical results showed that the obtained Fe 3 O 4 -SiO 2 nanoparticles possess core-shell nanostructures, high monodispersity, and uniform size and shape. The core, shell, and their combination are all in nanoscale. The average particle size of the resultant Fe 3o4 -Si0 2 nanocomposites is about 19 nm, and the average thickness of the nanocomposite shells is about 6 nm. Furthermore, the final FeO 4 -SiO 2 core-shell nanoparticles present good magnetic properties. A proposed formation mechanism of monodisperse Fe 3 O 4 -SiO 2 nanocomposites with core-shell structure is also presented in this paper, which is very important for the rational construction, design, and synthesis of other monodisperse core-shell nanocomposites with uniform size and shape.
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