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    INVESTIGATION OF FREQUENCY-INDEPENDENT IMPEDANCE BEHAVIOR IN CONDUCTING POLYMERS

    Cover for INVESTIGATION OF FREQUENCY-INDEPENDENT IMPEDANCE BEHAVIOR IN CONDUCTING POLYMERS
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    View/Open: Kayinamura_georgetown_0076D_10807.pdf (1.8MB) Bookview

    Creator
    Kayinamura, Yohani Petero
    Advisor
    Rubinson, Judith F
    Abstract
    Biocompatibility and low, frequency-independent impedance are critical in the design of electrodes for bioelectric signal sensing applications. These conditions could be regarded as the minimum requirements in order to ensure the device performance and recorded signal fidelity. While conducting polymers have shown promise for development of sensing and stimulating bio-electrodes, their reactive impedance characteristics which result from slow ionic diffusion and double layer capacitance present challenges for designing reliable devices. Their reactive impedance, introduces a non-linear and ill-behaved high-pass filter that corrupts the recorded signal.
     
    We have fabricated and optimized electrodes modified with a series of poly (heterolenes) that appear to exhibit low impedance which is characterized by non-diffusion-governed behavior in the frequency range relevant for physiological signals. Based on the impedance results obtained for the electrodes we have developed a model for charge transport in the polymer film which does not rely on the incorporation of the well-known Warburg element. A correlation of experimental impedance data with the proposed equivalent circuit and morphological models is also established. The concluding remarks briefly highlight the practical implications of these results and their preliminary in vivo results.
     
    Description
    Ph.D.
    Permanent Link
    http://hdl.handle.net/10822/557945
    Date Published
    2010
    Subject
    Conducting polymer; Electrochemistry; Electropolymerization; Impedance spectroscopy; Organic semiconductor; sensing stimulation; Chemistry, Analytic; Chemistry, Analytical;
    Type
    thesis
    Embargo Lift Date
    2015-05-15
    Publisher
    Georgetown University
    Extent
    185 leaves
    Collections
    • Graduate Theses and Dissertations - Chemistry
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    Georgetown University Seal
    ©2009 - 2022 Georgetown University Library
    37th & O Streets NW
    Washington DC 20057-1174
    202.687.7385
    digitalscholarship@georgetown.edu
    Accessibility