Preparation And Characterization Of Multifunctional Fe₃O₄/ZnO/SiIO₂ Nanocomposites

In the dissertation, Fe₃O₄/ZnO nanocomposites and Fe₃O₄/ZnO/SiO₂ nanocomposites were successfully synthesized. And the structure, size, the magnetic property, the optical properties of these nanocomposites were characterized by various ways. The details are as follows:1. Fe₃O₄ nanoparticles were synthesized through the coprecipitation and hight temperature decomposition. And the structure, magnetic properties of Fe₃O₄ nanoparticles were studied. The result of XRD, magnetic curve revealed that Fe₃O₄ nanoparticles possessed the cubic inverse spinel structure and the superparamagnetism. For hight temperature decomposition, Fe₃O₄ nanoparticles were monodisperse and possesed narrow size distribution and rule morphology.2. Fe₃O₄ nanoparticles were used as seeds for the deposit of ZnO nanocrystals to form Fe₃O₄/ZnO nanocomposites in water phase and oil phase respectively. Fe₃O₄/ZnO were studied. The result revealed that the nanocomposites simultaneously possessed the superparamagnetism of Fe₃O₄ and photoluminesence properties of ZnO.3. Multifunctional Fe₃O₄/ZnO/SiO₂ were synthesized by St?ber method. The structure, morphology, magnetic and optical properties of the nanocomposites were studied. And the structure, morphology, magnetic properties and photoluminesence properties of the s were studied. The result of XPS, EDS revealed that Fe₃O₄/ZnO nanocomposites were covered by SiO₂, and the nanocomposites possessed the superparamagnetism and photoluminesence properties of Fe₃O₄/ZnO nanocomposites. Rasonance Raman scattering was not effect due to the layer of silica.