Studies of controllable colour change properties of polyaniline film

The controllable colour change properties of polyaniline film have been studied in this paper. The colour distribution in two-dimention space of electrode potential and PH value has been abtained. It is demonstrated by impendance spectra of PAn film with different colour that the colour of PAn film is interrelated tightly with the structure of the film. It is shown experimentally that the colour of PAn film in the “forbidden area” can be still changed at certain electrochemical condition.