Investigation of a semiconductor bioelectrode with Ohmic behavior in vivo: Impedance spectroscopy of p-type semiconductor electrodes in perfused living heart

In the majority of impedance spectroscopy experiments performed for characterization of the semiconductor∣electrolyte interface, mass transport effects produce a diffusional element in the impedance spectrum. We report here, results obtained in the heart that has been perfused for cardioplegia with...

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Bibliographic Details
Published in:Chemical physics letters 2006-02, Vol.419 (1), p.277-287
Main Authors: Ovadia, Marc, Zavitz, Daniel H., Rubinson, Judith F., Park, DaeGyun, Chou, Howard A.
Format: Article
Language:English
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Summary:In the majority of impedance spectroscopy experiments performed for characterization of the semiconductor∣electrolyte interface, mass transport effects produce a diffusional element in the impedance spectrum. We report here, results obtained in the heart that has been perfused for cardioplegia with Tyrode’s buffer. Electrodes employed include polypyrrole, polyaniline, poly(3-methylthiophene), and poly(3,4-ethylenedioxythiophene). With the exception of a small, approximately constant – Im{ Z} element (possibly related to the back junction), metallurgically perfect poly(3,4-ethylenedioxythiophene) electrodes exhibited Ohmic behavior. Such an electrode is important for sensing of biological signals since it does not suffer from the high-pass filtering traceable to charge accumulation at conductor surfaces, thus implying removal of Goüy–Chapman–Stern reactances.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2005.11.053