Synthesis and Magnetic Characterization of Graphite-Coated Iron Nanoparticles

Abstract EN

Graphite-coated iron nanoparticles were prepared from magnetite nanoparticles by chemical vapour deposition (CVD) under methane and hydrogen atmosphere.

After being purified from carbon excess, graphite-coated iron nanoparticles were tested for morphological and magnetic properties.

It was found that, during the thermal process, magnetite nanoparticles 6 nm in size coalesce and transform into graphite-coated iron 200 nm in size, as revealed by scanning electron microscopy (SEM).

Raman characterization assessed that high-quality graphite coats the iron core.

Magnetic measurements revealed the phase change (magnetite to iron) as an increase in the saturation magnetization from 50 to 165 emu/g after the CVD process.