一步还原法制备纳米铁粉

Synthesis of Fe nanoparticles via one-step reduction method

摘要:

本文采用一种新方法——一步还原法制备了纳米铁粉颗粒。过量的柠檬酸在620_oC有助于形成纯相、结晶高的α-Fe。纳米铁粉被X射线衍射(XRD)、透射电子显微镜(TEM)、振动样品磁强计(VSM)进行了表征,形貌结果表明产物形成了粒径在30nm左右的近球形的纳米颗粒。磁滞回线说明了纳米铁颗粒的饱和磁化强度为198.97 emu/g,作为磁性材料具有很好的铁磁性能。一步还原法生产颗粒粒径分布窄、可控、流程短,可用于大规模生产。

Abstract:

In the present work, the Fe nanoparticles were synthesized via a novel method one-step reduction method. The excessive citric acid helps to obtain pure and high crystallinity α-Fe and the appropriate temperature (at 620 _oC). The Fe nanoparticles were carefully characterized by the X-ray diffraction, transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). The morphological characterization indicates that the Fe nanoparticles present spherical shape with diameter of 30 nm. The magnetization hysteresis loops reveal the high saturation magnetization (Ms=198.97 emu/g) and the good ferromagnetic behavior of the magnetic materials. The one-step reduction method for nanoparticles synthesis has the advantages of controllable, short process, large-scale production, and will be an important method of producing nanoparticles.