Elimination of undesirable water layers in solid-contact polymeric ion-selective electrodes

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dc.contributor.authorVeder, JPen_AU
dc.contributor.authorDe Marco, Ren_AU
dc.contributor.authorClarke, Gen_AU
dc.contributor.authorChester, Ren_AU
dc.contributor.authorNelson, Aen_AU
dc.contributor.authorPrince, KEen_AU
dc.contributor.authorPretsch, Een_AU
dc.contributor.authorBakker, Een_AU
dc.date.accessioned2009-11-05T05:02:53Zen_AU
dc.date.accessioned2010-04-30T05:07:07Zen_AU
dc.date.available2009-11-05T05:02:53Zen_AU
dc.date.available2010-04-30T05:07:07Zen_AU
dc.date.issued2008-09-01en_AU
dc.date.statistics2008-09-01en_AU
dc.description.abstractThis study aimed to develop a novel approach for the production of analytically robust and miniaturized polymeric ion sensors that are vitally important in modem analytical chemistry (e.g., clinical chemistry using single blood droplets, modem biosensors measuring clouds of ions released from nanoparticle-tagged biomolecules, laboratory-on-a-chip applications, etc.). This research has shown that the use of a water-repellent poly(methyl methacrylate)/poly(decyl methacrylate) (PMMA/PDMA) copolymer as the ion-sensing membrane, along with a hydrophobic poly(3-octylthiophene 2,5-diyl) (POT) solid contact as the ion-to-electron transducer, is an excellent strategy for avoiding the detrimental water layer formed at the buried interface of solid-contact ion-selective electrodes (ISEs). Accordingly, it has been necessary to implement a rigorous surface analysis scheme employing electrochemical impedance spectroscopy (EIS), in situ neutron reflectometry/EIS (NR/EIS), secondary ion mass spectrometry (SIMS), and small-angle neutron scattering (SANS) to probe structurally the solid-contact/membrane interface, so as to identify the conditions that eliminate the undesirable water layer in all solid-state polymeric ion sensors. In this work, we provide the first experimental evidence that the PMMA/PDMA copolymer system is susceptible to water "pooling" at the interface in areas surrounding physical imperfections in the solid contact, with the exposure time for such an event in a PMMA/PDMA copolymer ISE taking nearly 20 times longer than that for a plasticized poly(vinyl chloride) (PVC) ISE, and the simultaneous use of a hydrophobic POT solid contact with a PMMA/PDMA membrane can eliminate totally this water layer problem. © 2008, American Chemical Societyen_AU
dc.identifier.citationVeder, J. P., De Marco, R., Clarke, G., Chester, R., Nelson, A., Prince, K., Pretsch, E., & Bakker, E. (2008). Elimination of undesirable water layers in solid-contact polymeric ion-selective electrodes. Analytical Chemistry, 80(17), 6731-6740. doi:10.1021/ac800823fen_AU
dc.identifier.govdoc1455en_AU
dc.identifier.issn0003-2700en_AU
dc.identifier.issue17en_AU
dc.identifier.journaltitleAnalytical Chemistryen_AU
dc.identifier.pagination6731-6740en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/ac800823fen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2210en_AU
dc.identifier.volume80en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectLayersen_AU
dc.subjectIon selective electrode analysisen_AU
dc.subjectWateren_AU
dc.subjectSmall angle scatteringen_AU
dc.subjectSpectroscopyen_AU
dc.subjectSensorsen_AU
dc.titleElimination of undesirable water layers in solid-contact polymeric ion-selective electrodesen_AU
dc.typeJournal Articleen_AU
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