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针形铁黄纳米粒子表面包覆无机物如Si、Co等氧化物形成复合纳米粒子,是改善金属磁性记录粉性能的重要方式.采用ICP,TEM,XPS方法研究复合纳米粒子的表面性质,结果表明包硅复合粒子的表面形成均匀、致密的SiO2薄膜,表面层与基体表面间的界面结构类似异质结,导致粒子的XPS谱图中 Fe 2p谱峰发生2.7eV的化学位移;而包钴复合粒子由于钴在铁黄表面的吸附发生在部分晶面上而无法形成均匀、致密的薄膜,XPS谱图主要发生因表面荷电而导致的物理位移.
The surface of acicular yellow iron nanoparticles coated with inorganic substances such as Si, Co and other oxides to form composite nanoparticles is an important way to improve the performance of magnetic recording metal powder.The surface properties of composite nano-particles were studied by ICP, TEM and XPS. The results The results show that the surface of the composite silicon particles form a uniform and dense SiO2 thin film. The interface structure between the surface layer and the substrate surface is similar to that of the heterojunction, resulting in a chemical shift of 2.7 eV in the Fe 2p peak in the XPS spectrum of the particles. Due to the adsorption of cobalt on the yellow iron surface, the composite particles can not form a uniform and dense film due to the adsorption on the surface of the yellow iron. The XPS spectrum mainly results in the physical displacement caused by the surface charge.