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- Title
Poly(3-octylthiophene) as solid contact for ion-selective electrodes: contradictions and possibilities.
- Authors
Jarvis, Jennifer; Guzinski, Marcin; Pendley, Bradford; Lindner, Ernő
- Abstract
The hydrophobic conductive polymer, poly(3-octylthiophene) (POT), is considered as uniquely suited to be used as an ion-to-electron transducer in solid contact (SC) ion-selective electrodes (ISEs). However, the reports on the performance characteristics of POT-based SC ISEs are quite conflicting. In this study, the potential sources of the contradicting results on the ambiguous drift and poor potential reproducibility of POT-based ISEs are compiled, and different approaches to minimize the drift and the differences in the standard potentials of POT-based SC ISEs are shown. To set the potential of the POT film, it has been loaded with a 7,7,8,8-tetracyanoquinodimethane (TCNQ/TCNQ) redox couple. An approximately 1:1 TCNQ/TCNQratio in the POT film has been achieved through potentiostatic control of the potential of the redox couple-loaded conductive polymer. It is hypothesized that once the POT film has a stable, highly reproducible redox potential, it will provide similarly stable and reproducible interfacial potentials between the POT film and the electron-conducting substrate and result in SC ISEs with excellent reproducibility and potential stability. Towards this goal, the potentials of Au, GC, and Pt electrodes with drop-cast POT film coatings were recorded in KCl solutions as a function of time. Some of the POT films were loaded with TCNQ and coated with a K-selective membrane. The improvement in the potential stabilities and sensor-to-sensor reproducibility as a consequence of the incorporation of TCNQ in the POT film and the potentiostatic control of the TCNQ/TCNQratio is reported.
- Subjects
CONDUCTING polymers; TETRACYANOQUINODIMETHANE; PLATINUM electrodes; POLYMER films; POTENTIOSTAT
- Publication
Journal of Solid State Electrochemistry, 2016, Vol 20, Issue 11, p3033
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-016-3340-2