Direct Measurement and Mechanism of Electro-Chemomechanical Expansion and Contraction in Polypyrrole Films

Electro-chemomechanical expansion and contraction in polypyrrole films synthesized electrochemically from pyrrole in electrolytes of p -phenolsulfonic (PPS) acid has been measured directly in various supporting electrolytes. It is found that the films maintain a high electro-chemomechanical activity...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 39; no. 10R; p. 5918
Main Authors Keiichi Kaneto, Keiichi Kaneto, Yasuaki Sonoda, Yasuaki Sonoda, Wataru Takashima, Wataru Takashima
Format Journal Article
LanguageEnglish
Published 01.10.2000
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Summary:Electro-chemomechanical expansion and contraction in polypyrrole films synthesized electrochemically from pyrrole in electrolytes of p -phenolsulfonic (PPS) acid has been measured directly in various supporting electrolytes. It is found that the films maintain a high electro-chemomechanical activity and conductivity in the wide pH range from pH4 to pH10 and also at the reduced and oxidized states studied under the present conditions. The electro-chemomechanical expansion of polypyrrole films is primarily driven by the insertion of bulky ions, regardless of oxidation and reduction. This is different from the mechanism of polyaniline films, in which a conformation change of the polymer structure is involved. The mechanism of electro-chemomechanical deformation in polypyrrole film is discussed, taking the conductivity and conformation of polypyrrole into consideration.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.39.5918