A facile strategy for synthesis of spinel ferrite nano-granules and their potential applications
2016
Cao, Derang | Pan, Lining | Li, Hao | Li, Jianan | Wang, Xicheng | Cheng, Xiaohong | Wang, Zhenkun | Wang, Jianbo | Liu, Qingfang
We have demonstrated a facile method to synthesize a number of spinel ferrite nano-granules in dimethyl formamide (DMF) through a calcination process under air. There is no pH regulation, gas atmosphere, centrifugation, supplementary reagents, or other complicated and cumbersome procedures during the preparing process. The structures, morphologies, and magnetic properties of NiFe₂O₄, CoFe₂O₄, and NiZnFe₂O₄ nano-granules in various DMF concentrations and different calcination temperatures were investigated systematically, and other MFe₂O₄ nano-granules were also investigated by this method. As a result, it will cause an impurity phase at low DMF concentration or low calcination temperature, and large quantities of uniform nano-granules will be achieved at about 680 °C in pure DMF. The results show that the method realizes a simple, rapid and convenient route for assembling unitary and binary spinel ferrite nano-granules. In addition, the formation mechanism of the nano-granules was also studied in detail, and DMF plays a dispersing and covering role during the reaction. This synthetic approach also shows great potentiality in the synthesis of maghemite γ-Fe₂O₃ with high saturation magnetization, and rare nonmetal-doped CoFe₂O₄ is prepared using this strategy. Magnetic properties of doped CoFe₂O₄ nano-granules are also improved. These results provide a convenient way for the advancement of magnetic nanomaterials.
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