Infrared reflection of conducting polyaniline polymer coating

Abstract

The infrared reflective behavior of a “coating–glass–coating” system, i.e. a glass plate with double conducting polyaniline polymer coatings, was investigated by experiments and theoretical calculations. A measurement method for the extinction coefficient of the polyaniline polymer coating on the glass plate with double coatings is given. The infrared reflectance of the coating is dependent on its thickness, and increases when the thickness increases. The rate of increase reduces when the thickness of the coating is greater than 2 μm. The infrared reflectance of the coating is almost independent of the thickness of the glass plate substrate over the range from 1 mm to 25 mm. However, it is highly dependent on the refractive index of the glass. Generally, it increases with the increase in the refractive index of the glass. The thickness of the coating should be greater than its minimum thickness, i.e. its penetration depth of electromagnetic waves. The minimum thickness is around 1 μm for the polyaniline polymer coatings.