Production and Properties of Transparent Electroconductive Coating on Polyester Film

Abstract

Indium oxide was vacuum deposited onto the surface of polyester films. The oxide is reduced to In2O by sublimation and a thin opaque electroconductive coating is obtained. The coating was thermally oxidized in the air below 200°C. The resulting film showed transmission of 80 to 95% for visible light and surface resistance of 200 to 500 ohm/sq. Small amount of stannic oxide doped to the indium oxide improves the surface resistance and determines the optimum temperature of the substrate. The mechanism of formation and the properties of the coating were discussed.