Abstract
Study on Electrochromic Effect of Polyaniline Film. The light transmission factor of an electrochromic film changesreversibly with the application of an electrical voltage. Thereby the transparent film becomes reversibly opaque so thatit may be used to control light transmission. In this paper the results of a study on polyaniline film as an electrochromicactive material is reported. Polyaniline looks yellow transparent in the reduced state and turns to green-blue at itsoxidized state. The electrochromic device considered in this paper was fabricated in planar configuration of ITO glass- polyaniline film - electrolyte - ITO glass which involved 1.0M H2SO4 solution. The measurement of the currentdensity yields voltamograms for several values of the rate of voltage change, while the optical characteristics weremeasured with ultraviolet-visible spectroscopy. To inspect the light control properties, the intensity of solar radiationpropagating through the device was derived. It is found that in its reduced state, the device transmits 70% of theincoming radiation, while in the oxidized state only 11% of the radiation is left. The result of recycling test indicatedthat film is stable over 5,000 cycles.
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