碳包裹镍核-壳结构复合纳米颗粒的制备及性能研究

摘要

Carbon encapsulated Ni core-shell structure nanoparticles were successfully prepared by anodic arc discharging plasma method and subsequently purified with acid treatment and magnetic separation. The composition, morphology, microstructure and particle size of the products by this process were investigated via the high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray energy dispersive spectrome-try (XEDS). The results show that the carbon encapsulated Ni nanoparticles possess clear core-shell structure, the core of the particles is face centered cubic structure Ni, and the shell of the particles is disorder carbons. The particles are scattered homogeneously in spherical or ellipsoidal shapes. The particle size of the nanocapsules ranges from 15nm to 40nm,with an averaged value about 30nm, and the thickness of the shells is about 6-8nm.%采用自行研制的实验装置,通过阳极弧放电等离子体技术成功制备了碳包裹镍核-壳结构纳米复合颗粒,并采用酸洗和磁选的方法对初产物进行了纯化.利用高分辨透射电子显微镜(HRTEM)、X射线衍射(XRD)、透射电子显微镜(TEM)和X射线能量色散分析谱仪(XEDS)等测试手段对样品的化学成分、形貌、微观结构和粒度等特征进行了表征.结果表明:阳极弧等离子体技术制备的碳包覆纳米颗粒具有明显的核(面心立方镍)-壳(无定形碳)结构,颗粒大多呈球形或椭球形,粒径分布在15～40nm范围,平均粒径为30nm,镍粒子外层碳的厚度为6～8nm.