Abstract
The electrochemical and optical properties of poly(isothianaphthene) (PITN) during electrochemical doping have been investigated by cyclic voltammetry and optical absorption spectrum measurements. PITN can be reversibly cation‐ and anion‐doped without decomposition of the material. This polymer, PITN, with these two reversible and stable redox states of different colors is a potential candidate for electrochromic displays. The existence of a residual charge (positive or negative) depending on the electrochemical cycle is pointed out and conditions to obtain the more or less full neutralization of this residual charge are described. Further, a reading‐writing device using a residual charge which remains PITN after the dedoping has been proposed.
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