Monodisperse Fe₃O₄/Fe Core/Shell Nanoparticles with Enhanced Magnetic Property

Abstract:

Core/shell type nanoparticles with an average diameter of 20nm were synthesized by chemical precipitation method. Firstly, Monodisperse Fe₃O₄ nanoparticles were synthesized by solvethermal method. FeSO₄ž7H₂O and NaBH₄ were respectively dissolved in distilled water, then moderated Fe₃O₄ particles and surfactant(PVP) were ultrasonic dispersed into the FeSO₄ž7H₂O solution. The resulting solution was stirred 2 h at room temperature. Fe could be deposited on the surface of monodispersed Fe₃O4 nanoparticles to form core-shell particles. The particles were characterized by using various experimental techniques, such as transmission electron microscopy (TEM), X-ray diffraction (XRD), AGM and DTA. The results suggest that the saturation magnetization of the nanocomposites is 100 emu/g. The composition of the samples show monodisperse and the sides of the core/shell nanoparticles are 20-30nm. It is noted that the formation of Fe₃O₄/Fe nanocomposites magnetite nanoparticles possess superparamagnetic property.

• Periodical: Advanced Materials Research (Volumes 306-307)
• Pages: 410-415
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.306-307.410
• Online since: August 2011
• Authors: Li Sun, Fu Tian Liu, Qi Hui Jiang, Xiu Xiu Chen, Ping Yang
• Keywords: Core-Shell Nanoparticle, Fe₃O₄/Fe Nanoparticle, Magnetic, Nanocomposite

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