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STRUCTURAL CHARACTERISTICS OF GAS SENSOR BASED ON CONDUCTING POLYMER

A. K. Vidybida1,* , A. S. Usenko1, A. L. Kukla2, A. S. Pavluchenko2, O. Yu. Posudievsky3, V. D. Pokhodenko3

Affiliation

  1. Bogolyubov Institute for Theoretical Physics, Metrologhichna str., 14-B, Kyiv 03143, Ukraine
  2. Institute of Semiconductor Physics, Prospect Nauky, 45, Kyiv 03028, Ukraine
  3. L. V. Pisarzhevsky Institute of Physical Chemistry, Prospect Nauky, 31, Kyiv 03028, Ukraine

Abstract

It was shown recently that it is possible to improve the characteristics of a chemical sensor by means of adequate processing of the adsorption-desorption noise, which normally occurs in microminiature sensors. The main idea is to subject the noisy output signal produced by a small-size sensor to a kind of threshold discrimination. Mathematical analysis made in [5] for an ideal adsorption-desorption noise allows one to conclude that selectivity of a sensor can be highly improved due to discrimination. In order to apply this idea to a concrete sensor, one needs to know its structural and functional characteristics, which govern the noise statistical properties. First of all, it is necessary to determine to what extent the process of analyte reception can be modeled by a pure surface absorption-desorption process. This is a structural characteristic. Among functional characteristics are the total number of analyte binding sites, r n , the binding-releasing rate constants, –k , and others. In this paper, we use sensor response kinetic curves to determine the above characteristics for a chemoresistive sensor based on polyaniline..

Keywords

Gas sensor, Noise, Polyaniline, Polymer.

Submitted at: Aug. 22, 2005
Accepted at: Nov. 24, 2005

Citation

A. K. Vidybida, A. S. Usenko, A. L. Kukla, A. S. Pavluchenko, O. Yu. Posudievsky, V. D. Pokhodenko, STRUCTURAL CHARACTERISTICS OF GAS SENSOR BASED ON CONDUCTING POLYMER, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 6, pp. 2815-2821 (2005)