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在惰性保护气氛下,采用直流碳弧等离子体法成功制备了碳包覆铁纳米颗粒,并利用X射线衍射(XRD)、高分辨透射电子显微镜(HRTEM)、X射线能谱仪(EDS)、透射电子显微镜(TEM)和相应选区电子衍射(ED)等测试手段,对样品的化学成分、形貌、物相结构、粒度等特征进行表征分析。实验结果表明:直流碳弧等离子体技术制备的碳包覆纳米金属颗粒具有明显的核-壳结构,内核金属结晶度较高,外壳碳为类石墨层结构,颗粒大多呈球形和椭球形,粒径分布在20 nm~60 nm范围,平均粒径为44 nm。
The carbon-coated iron nanoparticles were successfully prepared by direct current carbon arc plasma method under inert protective atmosphere and characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), X-ray energy dispersive spectroscopy (EDS) Transmission electron microscopy (TEM) and corresponding selected area electron diffraction (ED) were used to characterize the chemical composition, morphology, phase structure and particle size of the samples. The experimental results show that the carbon-coated nano metal particles prepared by DC carbon arc plasma have obvious core-shell structure, the inner core metal has high crystallinity, and the shell carbon is a graphite-like structure. Most of the particles are spherical and ellipsoidal, Diameter distribution in the 20 nm ~ 60 nm range, the average particle size of 44 nm.