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Novel Ion‐to‐Electron Transduction Principle for Solid‐Contact ISEs
Author(s) -
Hupa Elisa,
Vanamo Ulriika,
Bobacka Johan
Publication year - 2015
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201400596
Subject(s) - ion , potentiometric titration , electrode , transduction (biophysics) , materials science , coulometry , capacitance , analytical chemistry (journal) , electrochemistry , chemistry , chromatography , biochemistry , organic chemistry
Solid‐contact ion‐selective electrodes (SC‐ISEs) are traditionally employed as potentiometric sensors, where the ion activity is related to the zero‐current potential of the sensor versus the reference electrode. In this communication, an alternative ion‐to‐electron transduction principle for SC‐ISEs is introduced. The suggested signal transduction principle resembles “constant‐potential coulometry” utilizing the redox capacitance of the internal solid contact in order to convert changes in ion concentration (activity) into electrical current and charge. This short communication provides proof‐of‐concept for the suggested signal transduction method for SC‐ISEs utilizing poly(3,4‐ethylenedioxythiphene) (PEDOT) as the solid contact that was coated with a cation‐sensitive polymeric membrane.