The characteristics of nano-sized manganese oxide particles prepared by spray pyrolysis

Nano-sized Mn2O3 particles with regular morphologies were prepared using spray pyrolysis. The spherical, micron-sized precursor particles obtained from a spray solution with citric acid and ethylene glycol turned into nano-sized Mn2O3 particles after post-treatment. The particles prepared from a carrier gas with a high flow rate had fine sizes and regular morphologies after post-treatment. The mean sizes of the Mn2O3 particles obtained at the post-treatment temperatures of 800 and 900 °C were 90 and 250 nm, respectively. On the other hand, the Mn2O3 particles prepared from the spray solution without organic additives had irregular morphologies and broad size distributions. The particles prepared from the spray solution with citric acid and ethylene glycol had crystal Mn2O3 structures at the post-treatment temperatures of 600 and 1000 °C.