Preparation of Nano-Sized Tin Oxide Powder by Spray Pyrolysis Process

In this study, nano-sized indium oxide powder with the average particle size below 100 nm is prepared from the indium chloride solution by the spray pyrolysis process. The effects of the concentration of raw material solution, the nozzle tip size and the air pressure on the properties of powder were studied. As the indium concentration of the raw material solution increased from 40 g/l to 350 g/l, the average particle size of the powder gradually increased from 20 nm to 60 nm, yet the particle size distribution appeared more irregular, the intensity of a XRD peak increased and specific surface area decreased. As the nozzle tip size increased from 1 nm to 5 nm, the average particle size of the powder increased from 40 nm to 100 nm, the particle size distribution was much more irregular, the intensity of a XRD peak increased and specific surface area decreased. As the air pressure increased from 0.1 kg/cm to 0.5 kg/cm, the average particle size of the powder varies slightly upto 90~100 nm. As the air pressure increased from 1 kg/cm to 3 kg/cm, the average particle size decreased upto 50~60 nm, the intensity of a XRD peak decreased and the specific surface area increased.