Abstract

The filling of carbon nanotubes with Fe–Ni alloy via wet chemistry is presented. Crystalline Fe–Ni alloy nanoparticles consisting of Fe (75 at%) and Ni (25 at%), with diameters in the range of 5–10 nm and lengths of 10–50 nm, have been successfully introduced into carbon nanotubes. We anticipate that this method will lead to extensive study of the chemistry and physics of alloys inside nanotubes, which might find applications in catalysis, the fabrication of magnetic storage devices and nanoscale thermostats.