On-chip electrochemical detection of dissolved oxygen: eliminating the requirement for a permeable selective membrane

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dc.contributor.authorSeymour, Ian P.en
dc.contributor.authorBarry, Fionaen
dc.contributor.authorO'Riordan, Alanen
dc.contributor.authorRohan, James F.en
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderDepartment of Agriculture, Food and the Marine, Irelanden
dc.contributor.funderEuropean Regional Development Funden
dc.contributor.funderHORIZON EUROPE Reforming and enhancing the European Research and Innovation systemen
dc.date.accessioned2025-09-11T10:03:43Z
dc.date.available2025-09-11T10:03:43Z
dc.date.issued2025-09-03en
dc.description.abstractMembrane-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.en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid138689en
dc.identifier.citationSeymour, 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.2025.138689en
dc.identifier.doi10.1016/j.snb.2025.138689en
dc.identifier.eissn1873-3077en
dc.identifier.endpage9en
dc.identifier.issn0925-4005en
dc.identifier.journaltitleSensors and Actuators B: Chemicalen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/17856
dc.identifier.volume446en
dc.language.isoenen
dc.publisherElsevier B.V.en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/Research Centres Programme::Phase 2/13/RC/2077_P2/IE/CONNECT_Phase 2/en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/Research Centres Programme::Phase 2/21/RC/10303_P2/IE/VistaMilk Phase II/en
dc.relation.projectinfo:eu-repo/grantAgreement/EC/HE::HORIZON-RIA/101135241/EU/Biosensor-Based Diagnostic Platform Enabling Real-Time Monitoring of Existing and Emerging Pollutants/BIOSENSEIen
dc.rights© 2025, the Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectMicrofabricateden
dc.subjectDissolved oxygenen
dc.subjectSensoren
dc.subjectHydrogen peroxideen
dc.subjectInterdigitated arrayen
dc.subjectDual-metalen
dc.subjectGenerator-collectoren
dc.titleOn-chip electrochemical detection of dissolved oxygen: eliminating the requirement for a permeable selective membraneen
dc.typeArticle (peer-reviewed)en
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