【摘要】 用直流电弧等离子体法分别在甲烷和(H2+Ar)气氛下制备了纳米镍粒子,利用XPS 和TEM等分析手段对两种纳米镍粒子的表层特征和形貌进行了分析,发现甲烷气氛下制备的纳米镍粒子表面包覆了多层碳膜,H2 +Ar 气氛下制备的纳米镍粒子由于要进行钝化处理表面包覆有氧化物膜(Ni2O3)。测定了两种纳米粉体的复介电常数和复磁导率以及以此为填料制备的导电涂料的导电率,证明了碳包覆纳米镍粒子的2~18GHz频率范围内电磁参数大小搭配及频响特性优于氧化物包覆纳米粒子。更多还原

【Abstract】 Nanometer Ni particles have been obtained by DC arc plasma in methane gas and in a mixture of H₂ and Ar gas atmosphere respectively. The distinct characterization and morphology of the layers on two kinds of Ni particle surfaces were investigated by X-ray photoelectron spectroscopy （XPS） and transmission electron spectroscopy （TEM） . It was observed that a carbon-rich and an oxide of Ni₂O₃ layers were formed on the surface of Ni particles obtained in methane gas, and in a mixture of H₂ and Ar gas atmosphere, respectively. The electricity conductivity of paint made by filling two kinds of nanometer Ni particle was investigated respectively. Complex permeability μ and complex permittivity ε of two kinds of Ni particle gas were measured by Agilent 8722ES microwave network analyzer in 2～18GHz band. The experimental results show that the microwave electromagnetic characteristic of Ni particle covered with carbon-rich layer was better than that of Ni particle covered with Ni₂O₃ layer.更多还原