Synthesis and application of iron-filled carbon nanotubes coated with FeCo alloy nanoparticles

FeCo alloy nanoparticles were coated onto the iron-filled carbon nanotubes by an electroless plating method. As-prepared samples were then annealed at different temperatures. The morphologies and structures of the samples were characterized, and the relationship between the soft magnetic properties and the Fe/Co ratios of the samples was established. The microwave absorbing characteristics of the samples were also evaluated. The results show that the soft magnetic characteristics of iron-filled carbon nanotubes can be improved after being coated with FeCo alloy nanoparticles and then heat treated, which results in more effective microwave absorption.