Abstract

The method of salt impregnation was applied to grow magnetic alloy nanoparticles (Ni₂₀Fe₈₀, Co₉₃Fe₀₇ or Ni₂₀Co₈₀) on multi-walled carbon nanotubes (MWCNTs). It was confirmed by SEM and XRD that the method gives nanopowders where the metal component is in the form of granules (20-40 nm in diameter) which are distributed over the surface and edges of the nanotubes. Measurements of magnetic properties confirmed that magnetic particles are small single-domain, randomly oriented assembly of spherical (or close to spherical) particles on the MWCNTs surface. Saturation magnetization of the investigated nanopowders weakly depends on temperature while coercive field increases under temperature decrease.

摘要

应用盐浸渍法生长磁性合金纳米粒子（Ni ₂₀ Fe ₈₀、Co ₉₃ Fe ₀₇或Ni ₂₀ Co ₈₀) 在多壁碳纳米管 (MWCNT) 上。SEM 和 XRD 证实，该方法得到的纳米粉末中金属成分呈颗粒状（直径 20-40 nm），分布在纳米管的表面和边缘。磁性测量证实，磁性颗粒是多壁碳纳米管表面上的球形（或接近球形）颗粒的小单畴、随机取向组装体。所研究的纳米粉末的饱和磁化强度对温度的依赖性较弱，而矫顽场随温度降低而增加。