Evidence for a surface confined ion-to-electron transduction reaction in solid-contact ion-selective electrodes based on poly(3-octylthiophene)

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dc.contributor.authorVeder, JPen_AU
dc.contributor.authorDe Marco, Ren_AU
dc.contributor.authorPatel, Ken_AU
dc.contributor.authorSi, Pen_AU
dc.contributor.authorGrygolowicz-Pawlak, Een_AU
dc.contributor.authorJames, Men_AU
dc.contributor.authorAlam, MTen_AU
dc.contributor.authorSohail, Men_AU
dc.contributor.authorLee, Jen_AU
dc.contributor.authorPretsch, Een_AU
dc.contributor.authorBakker, Een_AU
dc.date.accessioned2014-08-20T02:44:01Zen_AU
dc.date.available2014-08-20T02:44:01Zen_AU
dc.date.issued2013-11-05en_AU
dc.description.abstractThe ion-to-electron transduction reaction mechanism at the buried interface of the electrosynthesized poly(3-octylthiophene) (POT) solid-contact (SC) ion-selective electrode (ISE) polymeric membrane has been studied using synchrotron radiation-X-ray photoelectron spectroscopy (SR-XPS), near edge X-ray absorption fine structure (NEXAFS), and electrochemical impedance spectroscopy (EIS)/neutron reflectometry (NR). The tetrakis[3,5-bis(triflouromethyl)phenyl]borate (TFPB?) membrane dopant in the polymer ISE was transferred from the polymeric membrane to the outer surface layer of the SC on oxidation of POT but did not migrate further into the oxidized POT SC. The TFPB? and oxidized POT species could only be detected at the outer surface layer (≤14 ?) of the SC material, even after oxidation of the electropolymerized POT SC for an hour at high anodic potential demonstrating that the ion-to-electron transduction reaction is a surface confined process. Accordingly, this study provides the first direct structural evidence of ion-to-electron transduction in the electropolymerized POT SC ISE by proving TFPB? transport from the polymeric ISE membrane to the oxidized POT SC at the buried interface of the SC ISE. It is inferred that the performance of the POT SC ISE is independent of the thickness of the POT SC but is instead contingent on the POT SC surface reactivity and/or electrical capacitance of the POT SC. In particular, the results suggest that the electropolymerized POT conducting polymer may spontaneously form a mixed surface/bulk oxidation state, which may explain the unusually high potential stability of the resulting ISE. It is anticipated that this new understanding of ion-to-electron transduction with electropolymerized POT SC ISEs will enable the development of new and improved devices with enhanced analytical performance attributes.© 2013, American Chemical Society.en_AU
dc.identifier.citationVeder, J. P., De Marco, R., Patel, K., Si, P. C., Grygolowicz-Pawlak, E., James, M., Alam, M. T., Sohail, M., Lee, J., Pretsch, E., & Bakkert, E. (2013). Evidence for a surface confined ion-to-electron transduction reaction in solid-contact ion-selective electrodes based on poly(3-octylthiophene). Analytical Chemistry, 85(21), 10495-10502. doi:10.1021/ac4024999en_AU
dc.identifier.govdoc5399en_AU
dc.identifier.issn0003-2700en_AU
dc.identifier.issue21en_AU
dc.identifier.journaltitleAnalytical Chemistryen_AU
dc.identifier.pagination10495-10502en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/ac4024999en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5797en_AU
dc.identifier.volume85en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectNanotubesen_AU
dc.subjectElectrodesen_AU
dc.subjectMembranesen_AU
dc.subjectSensorsen_AU
dc.subjectPolymersen_AU
dc.titleEvidence for a surface confined ion-to-electron transduction reaction in solid-contact ion-selective electrodes based on poly(3-octylthiophene)en_AU
dc.typeJournal Articleen_AU
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