An investigation of the factors influencing stability in continuously-powered screen-printed amperometric dissolved oxygen sensors
An investigation of the factors influencing stability in continuously-powered screen-printed amperometric dissolved oxygen sensors
The continuously powered response of dissolved oxygen sensors fabricated as screen printed devices has been investigated. A reduction in the sensitivity of these devices has been observed when they are continuously powered at potentials of –0.6V versus Ag/AgCl reference electrodes. Periodically recorded voltammograms have indicated that the reduction in sensitivity can be attributed to a build up of hydroxyl ions beneath the sensor membrane that inhibits oxygen reduction. It has been found that powering these devices at more negative potentials mitigates against the decrease in sensitivity but results in a slowly increasing sensitivity. This is attributed to an increase in the effective area of the working electrode resulting mainly from leakage through the waterproofing layer covering the electrode interconnects.
membranes, oxygen, screen-printing, sensors, thick film
26-31
Atkinson, J.K.
5e9729b2-0e1f-400d-a889-c74f6390ea58
Glasspool, W.V.
0d4fac7e-d366-4b7c-b168-25fe36b76bb7
2001
Atkinson, J.K.
5e9729b2-0e1f-400d-a889-c74f6390ea58
Glasspool, W.V.
0d4fac7e-d366-4b7c-b168-25fe36b76bb7
Atkinson, J.K. and Glasspool, W.V.
(2001)
An investigation of the factors influencing stability in continuously-powered screen-printed amperometric dissolved oxygen sensors.
Microelectronics International, 18 (2), .
Abstract
The continuously powered response of dissolved oxygen sensors fabricated as screen printed devices has been investigated. A reduction in the sensitivity of these devices has been observed when they are continuously powered at potentials of –0.6V versus Ag/AgCl reference electrodes. Periodically recorded voltammograms have indicated that the reduction in sensitivity can be attributed to a build up of hydroxyl ions beneath the sensor membrane that inhibits oxygen reduction. It has been found that powering these devices at more negative potentials mitigates against the decrease in sensitivity but results in a slowly increasing sensitivity. This is attributed to an increase in the effective area of the working electrode resulting mainly from leakage through the waterproofing layer covering the electrode interconnects.
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Published date: 2001
Keywords:
membranes, oxygen, screen-printing, sensors, thick film
Identifiers
Local EPrints ID: 21938
URI: http://eprints.soton.ac.uk/id/eprint/21938
ISSN: 1356-5362
PURE UUID: 6bd4aa33-c59f-4cea-82dc-1e5386ea2c05
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Date deposited: 14 Mar 2006
Last modified: 08 Jan 2022 02:31
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Author:
W.V. Glasspool
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