Patent ID: 8512602

Claim:
A method of producing ITO powders having a crystal diameter less than 20 nm, the method comprising: a first step of dissolving nitrate salt containing indium and nitrate salt containing tin into an organic solvent, then applying heat treatment to the organic solvent at a temperature ranging from 110° C. to 250° C., and thermally decomposing the nitrate salt containing indium and the nitrate salt containing tin, to thereby prepare a precursor containing indium and tin; and a second step of applying heat treatment to the precursor containing the indium and tin in an organic solvent heated at a temperature ranging from 200° C. to 350° C. to thereby generate ITO particles, wherein the organic solvent used in the first step is at least one solvent selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, and tripropylene glycol, and the organic solvent used in the second step is at least one solvent selected from the group consisting of diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, and tripropylene glycol.