On-chip electrochemical detection of dissolved oxygen: eliminating the requirement for a permeable selective membrane
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Published Version
Supplementary material
Date
2025-09-03
Authors
Seymour, Ian P.
Barry, Fiona
O'Riordan, Alan
Rohan, James F.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier B.V.
Published Version
Abstract
Membrane-free electrochemical dissolved oxygen sensors were developed using micro interdigitated electrode arrays. The optimised sensor for detection of dissolved oxygen should contain a gold generator electrode to produce hydrogen peroxide, and a platinum collector electrode for the subsequent detection. The microfabrication process required platinum electrodeposition onto one comb of a gold interdigitated array. The deposition also decreased the inter-electrode gap and increased the collection efficiency. The dual metal IDE was then used to sense dissolved oxygen in water. A pre-treatment step was also required to improve the sensitivity of platinum to hydrogen peroxide ensuring a clean, reproducible surface for each test. The developed sensor accurately detected oxygen concentrations between 0 and 9 ppm, with a sensitivity of 1.59 nA/ppm and an LOD of 0.36 ppm. The detection of oxygen was also tested in the presence of unknown interferents, in estuarine river water, and with known interferents. It was found that the magnitude of hydrogen peroxide oxidation was generally unaffected by the presence of interferents, indicating a potential for interferent free oxygen detection without the requirement of oxygen permeable membranes.
Description
Keywords
Microfabricated , Dissolved oxygen , Sensor , Hydrogen peroxide , Interdigitated array , Dual-metal , Generator-collector
Citation
Seymour, I., Barry, F., O’Riordan, A. and Rohan, J.F. (2026) “On-chip electrochemical detection of dissolved oxygen: eliminating the requirement for a permeable selective membrane,” Sensors and Actuators B: Chemical, 446, 138689 (9pp). https://doi.org/10.1016/j.snb.2025.138689