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针对Fe_3O_4尺寸均匀性及粒径可控性难题,采用反向共沉淀法制备了磁性纳米Fe_3O_4.应用透射电子显微镜(TEM)、X射线衍射仪(XRD)和振动式样品磁强计(VSM)对合成的磁性纳米Fe_3O_4的形貌、结构、粒径及磁性能进行了表征。结果表明:反向共沉淀法合成的样品近似球形,物相分析为尖晶石结构的Fe_3P_4;与正向共沉淀法相比,该方法合成的粒子粒径小,且粒径分布均匀;反向法合成的样品室温下无剩磁和矫顽力,具有超顺磁性;纳米粒子随反应温度升高,粒径尺寸增大;随反应溶液pH值增大,粒径尺寸减小。
In order to solve the problem of size uniformity and size controllability of Fe_3O_4, magnetic nano-Fe_3O_4 was prepared by reverse coprecipitation method and characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) The morphology, structure, particle size and magnetic properties of the synthesized magnetic nano-Fe 3 O 4 were characterized. The results show that the sample prepared by reverse coprecipitation method is nearly spherical and the phase analysis is Fe_3P_4 with spinel structure. Compared with the forward coprecipitation method, the synthesized particles have small particle size and uniform particle size distribution. The samples synthesized by the method have no remanence and coercivity at room temperature, and have superparamagnetism. With the increase of reaction temperature, the size of nanoparticles increases. With the increase of the pH of the reaction solution, the particle size decreases.