| Summary: | 碩士 === 國立臺北科技大學 === 資源工程研究所 === 101 === Due to that morphology and size play very important roles in determining chemical and physical properties of materials, in recent years, there is increasing attentions on the development of synthesis method to control the morphology and size of particles. Comparing with Fe3O4 nanoparticle, Fe3O4 submicroparticle has potential applications in the fields of magnetic resonance imaging, sensors, targeted drug delivery and color displays. The preparation of micro Fe3O4 particle with well defined nanostructure and morphology is of particular interest of this study. The synthesis of submicro Fe3O4 particle including thermal decomposition, co-precipitation, hydrothermal, electrochemical method, micro-emulsion method and sol-gel methods. In this study, we focused on the hydrothermal method to control the morphology and size of particles. The effect of additives, such as soft template PEG-6000 and NaF salt, on the synthesis of Fe3O4 micro-structure were investigated. It was demonstrated that two kinds of shapes of Fe3O4, including micro-spheres and micro-octahedron, can be prepared by adjusting the hexamethylenetetramine concentration, the amount of additive, reaction time and reaction temperature. The morphology of Fe3O4 were spheres-like with PEG-6000. The morphology of Fe3O4 were octahedron-like with sodium fluoride.
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