Kinetic Modulation of Pulsed Chronopotentiometric Polymeric Membrane Ion Sensors by Polyelectrolyte Multilayers

Y Xu; Chao Xu; A Shvarev; T Becker; Roland De Marco; Eric Bakker

doi:10.1021/ac071201p

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Kinetic Modulation of Pulsed Chronopotentiometric Polymeric Membrane Ion Sensors by Polyelectrolyte Multilayers

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Kinetic Modulation of Pulsed Chronopotentiometric Polymeric Membrane Ion Sensors by Polyelectrolyte Multilayers

Y Xu, Chao Xu, A Shvarev, T Becker, Roland De Marco and Eric Bakker

Analytical Chemistry, Vol.79(18), p.7154–7160

2007

DOI: https://doi.org/10.1021/ac071201p

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Abstract

Analytical Chemistry

kinetic modulation

polymeric membrane ion-selective electrodes

pulsed chronopotentiometry

Polymeric membrane ion-selective electrodes are normally interrogated by zero current potentiometry, and their selectivity is understood to be primarily dependent on an extraction/ion-exchange equilibrium between the aqueous sample and polymeric membrane. If concentration gradients in the contacting diffusion layers are insubstantial, the membrane response is thought to be rather independent of kinetic processes such as surface blocking effects. In this work, the surface of calcium-selective polymeric ion-selective electrodes is coated with polyelectrolyte multilayers as evidenced by Î¶ potential measurements, atomic force microscopy, and electrochemical impedance spectroscopy. Indeed, such multilayers have no effect on their potentiometric response if the membranes are formulated in a traditional manner, containing a lipophilic ion exchanger and a calcium-selective ionophore. However, drastic changes in the potential response are observed if the membranes are operated in a recently introduced kinetic mode using pulsed chronopotentiometry. The results suggest that the assembled nanostructured multilayers drastically alter the kinetics of ion transport to the sensing membrane, making use of the effect that polyelectrolyte multilayers have different permeabilities toward ions with different valences. The results have implications to the design of chemically selective ion sensors since surface-localized kinetic limitations can now be used as an additional dimension to tune the operational ion selectivity.

Details

Title: Kinetic Modulation of Pulsed Chronopotentiometric Polymeric Membrane Ion Sensors by Polyelectrolyte Multilayers
Authors: Y Xu (Author) - Purdue University, United States
Chao Xu (Author) - Purdue University, United States
A Shvarev (Author) - Oregon State University, United States
T Becker (Author) - Curtin University of Technology
Roland De Marco (Author) - Curtin University of Technology
Eric Bakker (Author) - Purdue University, United States
Publication details: Analytical Chemistry, Vol.79(18), p.7154–7160
Publisher: American Chemical Society
Date published: 2007
DOI: 10.1021/ac071201p
ISSN: 0003-2700
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99449422102621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Chemistry, Analytical