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Comparative studies between ion‐selective field effect transistors and ion‐selective electrodes with polymeric membranes
Author(s) -
Miyahara Yuji,
Simon Wilhelm
Publication year - 1991
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.1140030408
Subject(s) - membrane , ionophore , electrolyte , electrode , materials science , hysteresis , ion , isfet , ion selective electrode , field effect transistor , analytical chemistry (journal) , selectivity , chemical engineering , chemistry , transistor , chromatography , voltage , organic chemistry , catalysis , electrical engineering , biochemistry , physics , quantum mechanics , engineering
Characteristics of ion‐selective field effect transistors (ISFETs) and ion‐selective electrodes (ISEs) with solvent polymeric membranes were compared for slope, selectivity, drift, and hysteresis. Drift and hysteresis of ISFETs were significantly inferior to those of analogous ISEs. Experiments using conventional ISEs with internal electrolyte solutions and ion‐selective liquid membranes of different kinds indicate that both primary ion and ionophore are necessary in the internal electrolyte solution and the ion‐selective membrane, respectively, to achieve small drift and small hysteresis. It is, therefore, concluded that to realize highly reliable membrane‐solid contact devices, the interface between the membrane and the solid in membrane–solid contact devices like ISFETs and coated wire electrodes (CWEs) should be electrochemically defined.