Modeling macroscopic transport of superoxide radicals through nonoheterogeneous biosensor film

    Authors

    H. W. Song; T. B. Du;O. J. Ilegbusi

    Comments

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    Abbreviated Journal Title

    Sens. Actuator B-Chem.

    Keywords

    superoxide; nanocomposite; sensor; amperometric; METAL-FILMS; DISMUTASE; CONDUCTIVITY; SELECTIVITY; PEROXIDASE; MECHANISM; OXYGEN; Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation

    Abstract

    We develop a mathematical model to represent the transport phenomena and electrochemical reaction kinetics during amperometric measurement of superoxide radical concentration using ZnO-polymer nanocomposite sensor. This model assumes a logarithmic normal distribution for the nanoparticles immobilized in the polymer matrix and an empirical relation for the diffusion coefficient of superoxide radicals as a function of pore volume fraction. A kinetic with secondary order rate constant is used to represent the electrochemical reactions of electron transfer from the superoxide radicals to nanoparticles. The predicted results include the effect of diffusion coefficient on concentration and electrical conductivity. © 2004 Elsevier B.V All rights reserved.

    Journal Title

    Sensors and Actuators B-Chemical

    Volume

    106

    Issue/Number

    2

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    654

    Last Page

    659

    WOS Identifier

    WOS:000228969100023

    ISSN

    0925-4005

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