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采用约束弧等离子体技术制备碳包覆铁纳米颗粒,利用X射线衍射、透射电子显微镜、高分辨透射电子显微镜、X射线能量色散分析谱仪和N2吸附等测试手段对样品的化学成分、形貌、微观结构、比表面积和粒度等特征进行表征分析。结果表明:采用约束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,内核金属为体心立方结构的铁,外壳为无定形碳。颗粒大多呈球形和椭球形,粒径分布在15～40nm范围内,平均粒径为30nm,内核粒径为18nm,外层碳的厚度为6～8nm,比表面积为24m2/g。
Carbon coated iron nanoparticles were prepared by confined arc plasma technique. The chemical composition, morphology and morphology of the samples were characterized by X-ray diffraction, transmission electron microscopy, high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy and N2 adsorption. , Microstructure, specific surface area and particle size were characterized. The results show that the carbon-coated nano-metal particles prepared by confined arc plasma have obvious core-shell structure, the core metal is body-centered cubic iron, and the shell is amorphous carbon. Most of the particles are spherical and ellipsoidal, particle size distribution in the range of 15 ~ 40nm, the average particle size of 30nm, the core particle size of 18nm, the outer carbon thickness of 6 ~ 8nm, the specific surface area of 24m2 / g.