Fast and Controllable Synthesis of Core-Shell FeO-C Nanoparticles by Aerosol CVD.

A method for simple and fast (30-60 s) synthesis of spherical "FeO core-carbon shell" structures by atmospheric pressure aerosol pyrolysis of benzoic acid in dimethylformamide solutions containing dispersed FeO 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 FeO 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.