Title

Modeling macroscopic transport of superoxide radicals through nonoheterogeneous biosensor film

Authors

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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