Nanocrystalline iron particles synthesized by chemical vapor condensation without chilling

Iron nanoparticles were synthesized without a chilling device in the condensation system of gases vaporized from iron-pentacarbonyls as starting precursors. The size distribution of the synthesized iron particles was wider, ranging from 10 nm to 100 nm, than that of the particles rapidly cooled on the surface of a chiller. The oxide shell thickness and carbon content were analyzed quantitatively in synthesized powders as well as their microstructures and magnetic properties.