Conducting polymer based electrochemical ion sensors

Krzysztof Maksymiuk 

Warsaw University, Faculty of Chemistry, Pasteura 1, Warszawa 02-093, Poland

Abstract

Thin films of conducting polymers (CP) due to coupled electronic and ionic conductivity as well as capability of reversible oxidation / reduction and membrane properties seem to be optimal materials for electrochemical sensors construction with facile chemical to electrical signal transduction.
Electrodes modified with stable CP films, as e.g. polypyrrole, polianiline and poly(3,4-ethylenedioxythiophene) are characterized by either anion- or cation-exchange properties and can be utilized to construct potentiometric ion-sensors [1]. The accessible concentration range from 10-5 M to 1 M is similar to that of classical ion-selective electrodes, the properties can be easy tailored by the choice of dopant ion and low-cost sensors can be obtained by a simple electropolymerization.
However, these simple sensors suffer from low selectivity and high susceptibility toward pH and redox interferences. Therefore, the most promising application of CP in potentiometric ion sensors is to use them as ion to electron transducer for ion-selective plastic membrane electrodes [1,2], where the above mentioned disadvantages are eliminated. All-solid-state and single-piece constructions of these electrodes will be characterized.
The capability of reversible oxidation / reduction of CP films, coupled with counter-ions release or incorporation can be utilized in amperometric ion-sensors [3]. Pulse- and ac-techniques applied with polypyrrole coated electrodes enable ion concentration determination within the range comparable to that typical for potentiometric method, but with significant elimination of redox interferences. A method of sensitivity and selectivity enhancement by appropriate choice of signal recording and time-scale of the experiment will be presented.
1. J. Bobacka, A. Ivaska, A. Lewenstam, Electroanalysis, 15 (2003) 366.
2. E. Bakker, M. Telting-Diaz, Anal.Chem., 74 (2002) 2781.
3. A. Michalska, S. Walkiewicz, K. Maksymiuk, Electroanalysis, 15 (2003) 509.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/1210 must be provided.

 

Related papers
  1. All-solid-state ion-selective electrodes with conducting polymer transducer under conditions of galvanostatic polarization
  2. Application of polyaniline nanoparticles in electrochemical and optical urea biosensors
  3. Tailoring polyacrylate based membranes for anion-sensing purposes
  4. Laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) aided insight into ion-sensing membranes
  5. Galvanostatic polarization of all-solid-state K+ selective electrodes with polypyrrole ion-to-electron transducer
  6. Novel solution-free reference electrodes for potentiometric applications
  7. Modification of the transducer - a key step for achieving improved analytical parameters of conducting polymer based all-solid-state ion-selective electrodes

Presentation: Tutorial lecture at SMCBS 2003 Workshop, by Krzysztof Maksymiuk
See On-line Journal of SMCBS 2003 Workshop

Submitted: 2003-09-08 15:58
Revised:   2009-06-08 12:55
Google
 
Web science24.com
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine