Hydrogen ion-selective electrolyte-gated organic field-effect transistor for pH sensing

A H+ ion-selective electrolyte-gated organic field-effect transistor (IS-EGOFET) with a broad detection range between pH 3 and pH 12, is presented. This pH sensor relies on an integrated EGOFET used as a transducer in combination with an ionophore-doped polymeric ion-selective membrane serving as a...

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Veröffentlicht in:Applied physics letters 2014-05, Vol.104 (19)
Hauptverfasser: Kofler, Johannes, Schmoltner, Kerstin, Klug, Andreas, List-Kratochvil, Emil J. W.
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Sprache:eng
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Zusammenfassung:A H+ ion-selective electrolyte-gated organic field-effect transistor (IS-EGOFET) with a broad detection range between pH 3 and pH 12, is presented. This pH sensor relies on an integrated EGOFET used as a transducer in combination with an ionophore-doped polymeric ion-selective membrane serving as a sensing element. The broad detection range was possible through a dynamic measurement protocol comprising a readjustment of the gate voltage, which ensures a stable device operation at a constant working point. The effectiveness of this dynamic approach is confirmed by stability investigations. On the basis of this pH sensor concept, the importance of an appropriate gating electrolyte is highlighted, giving insights into the working mechanism of EGOFETs.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4878539