An investigation on synthesis and magnetic properties of nanoparticles of Cobalt Ferrite coated with SiO2

International Journal of Nano Dimension

مقاله 7، دوره 4، شماره 1، آبان 2013، صفحه 51-56   

نوع مقاله: Reasearch Paper

شناسه دیجیتال (DOI): 10.7508/ijnd.2013.01.006

نویسندگان

S. Rostamzadehmansoor؛ M. S. Sadjadi^* ؛ K. Zare

Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran.

چکیده

SiO₂-coated Cobalt Ferrite (CoFe₂O₄) nanoparticles were obtained by the hydrolysis of tetraethylorthosilicate in the presence of CoFe₂O₄ nanoparticles in co-precipitation. The effects of SiO₂coating on the magnetic properties of CoFe₂O₄ nanoparticles were investigated. The structural, morphological and magnetic properties of as-prepared sample were characterization by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, transmission electron microscopy (TEM), Field emission scanning electron microscopy/energy dispersive x-ray analysis (FESEM-EDAX) and magnetic measurements were investigated using vibrating sample magnetometer (VSM). The morphology analysis confirmed that the obtained composite nanoparticles consisted of CoFe₂O₄ coated by SiO₂. It was shown that the saturation magnetization and coercivity of CoFe₂O₄ decreased after SiO₂ coating, which can be interpreted by the interparticle dipole-dipole interactions related to the magnetic particle volume fraction in the composite nanoparticles.

کلیدواژه‌ها

Synthesis؛ Magnetic Properties؛ SiO2-coated cobalt ferrite؛ nanoparticles؛ X-ray diffraction (XRD)؛ Energy dispersive