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A polypyrrole (PPy) film electrochemically grown in a thin slab vessel consisting of poly(tetrafluoroethylene) (PTFE) walls exhibits a notable anisotropy along the thickness direction. This anisotropy allows the film to bend in a regular direction upon electrochemical undoping and revert upon doping. In this study, the size effect, i.e., the length dependence of reduction current, of the actuator...
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