Fast and Controllable Synthesis of Core–Shell Fe₃O₄–C Nanoparticles by Aerosol CVD

Abstract

A method for simple and fast (30-60 s) synthesis of spherical "Fe₃O₄ core-carbon shell" structures by atmospheric pressure aerosol pyrolysis of benzoic acid in dimethylformamide solutions containing dispersed Fe₃O₄ nanoparticles is described. It has been experimentally shown that it is possible to control both the size of the core-shell particles and the size of Fe₃O₄ grains and their amount in the particle core by the variation of benzoic acid concentration in solution and using pre-stabilized by mannitol iron oxide nanoparticles. It has been found that particles with an average size of 250-350 nm are formed at the concentration of benzoic acid in the range 0.5-1 mol/L. At a concentration of about 1 mol/L, preliminary stabilization of iron oxide nanoparticles by mannitol with a size of about 180 nm is performed.