Synthesis of Fe3O4/SiO2/TiO2-Ag Core Shell Nanocomposites and Investigation of its Magnetic Properties

Subject Areas : journal of New Materials

فردین Ghasemi piranloo ¹ , سعیده Dadashian ² , فاطمه Bavarsiha ³

1 - مدیر و ریاست بخش پژوهش آزمایشگاه معتمد محیط زیست، شرکت فن آوران زیست کره، ابهر، زنجان، ایران
2 - کارشناس تحقیق آزمایشگاه معتمد محیط زیست، شرکت فن آوران زیست کره، ابهر، زنجان، ایران
3 - کارشناس آموزش آزمایشگاه معتمد محیط زیست، شرکت فن آوران زیست کره، ابهر، زنجان، ایران

Received: 2016-10-21 Accepted : 2018-05-08 Published : 2018-04-21

Keywords: Nanocomposite, Core&ndash, shell structure, Titanium oxide, Ag particle, magnetic recoverable,

Abstract :

In this study, core–shell structure Fe₃O₄/SiO₂/TiO₂-Ag nanocomposites were synthesized in several stages. At first the Fe₃O₄ magnetic particles were obtained using the carbon reduction method. Then the Fe₃O₄/SiO₂ composite was synthesized using Tetraethyl orthosilicate (TEOS) precursor via sol-gel method. In the following a shell of TiO₂ was coated directly on it. Finally, Ag particle was deposited on the surface of TiO₂ nano-shell by an in situ wet chemistry route. Prepared nanocomposites were characterized by environmental scanning electron microscopy analysis (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Vibrating Sample Magnetometer (VSM). The results revealed Fe₃O₄/SiO₂/TiO₂–Ag nanocomposites have been successfully synthesized. The average size of Fe₃O₄ particles was about 300-400 nm and the size of Fe3O4/SiO2 particles is averagely between 400-450 nm and the average size of Fe₃O₄/SiO₂/TiO₂-Ag particles was calculated between 450-480 nm. Saturation magnetization (M_s) of nanocomposite showed a decreasing from 80emu/g to 37emu/g. Further coating of SiO₂ and TiO₂ decreases the saturation magnetization.

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