Abstract
γ-Fe 2O 3/SiO 2 core–shell nanoparticles with an average diameter by about 30 nm were synthesized by hydrothermal reaction of Tetraethoxysilane and Fe(NO 3) 3⋅9H 2O as precursors. The phase component, structure and magnetic properties of the nanoparticles were characterized by X-ray diffraction, transmission electron microscopy and magnetic measurements. The results show that the uniform γ-Fe 2O 3 nanoparticles were capped with an amorphous SiO 2 thin shell by about 5 nm in the thickness. The effect of hydrothermal temperature and growth mechanism were discussed towards the end of this paper. The magnetic property of nanoparticles was also discussed.
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