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采用化学沉淀-水热法成功的合成了一种新颖的Ni0.75Zn0.25Fe2O4纳米晶包覆多壁碳纳米管(Ni0.75Zn0.25Fe2O4-CNTs)磁性复合材料。采用透射电镜、X射线衍射、红外光谱和振动样品磁强计等方法对制备的样品进行了表征。透射电镜结果表明Ni0.75Zn0.25Fe2O4纳米晶包覆在碳纳米管表面,纳米晶的大小为8～15nm。X射线衍射结果表明:200℃是制备纳米Ni0.75Zn0.25Fe2O4包覆碳纳米管复合材料较好的反应条件,比合成单相Ni0.75Zn0.25Fe2O4纳米晶的温度要低。磁性复合材料中Ni0.75Zn0.25Fe2O4晶体的大小约为16.0nm。红外结果表明NiZn的特征峰在590cm-1和414cm-1处。磁滞回线结果表明室温下复合材料具有较高的矫顽力(Hc=27244.3kA/m)。
A novel Ni0.75Zn0.25Fe2O4 nanocrystalline coated multi-walled carbon nanotube (Ni0.75Zn0.25Fe2O4-CNTs) magnetic composite has been successfully synthesized by chemical precipitation-hydrothermal method. The prepared samples were characterized by transmission electron microscopy, X-ray diffraction, infrared spectroscopy and vibrating sample magnetometer. Transmission electron microscopy showed that Ni0.75Zn0.25Fe2O4 nanocrystals were coated on the surface of carbon nanotubes, and the size of nanocrystals was 8-15 nm. X-ray diffraction results show that 200 ℃ is a better reaction condition for the preparation of nano-sized Ni0.75Zn0.25Fe2O4 coated carbon nanotube composites, which is lower than that of single-phase Ni0.75Zn0.25Fe2O4 nanocrystals. The size of Ni0.75Zn0.25Fe2O4 crystals in magnetic composites is about 16.0nm. Infrared results show that the characteristic peaks of NiZn are at 590 cm-1 and 414 cm-1. Hysteresis loop results show that the composites have higher coercivity (Hc = 27244.3kA / m) at room temperature.