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Issue 19, 2016
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A membrane-free cation selective water-gated transistor

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Sensors for the detection of waterborne cations are of great practical interest, and chemistry has synthesised a formidable catalogue of cation selective complexation agents (‘ionophores’) as selective sensitisers. Current ionophore-based sensors separate the complexation of the cation by the ionophore, and the transduction of complexation into an electrical signal, into separate components. We here unite both functions into a single, sensitised semiconducting layer of a water-gated organic thin film transistor (OTFT). The resulting OTFT transduces waterborne cations into an electrical signal with same selectivity, sensitivity, and limit of detection as established sensors at much simplified preparation and operation. This opens a new route to apply the ‘ionophore’ family of functional organic materials in practical cation sensors.

Graphical abstract: A membrane-free cation selective water-gated transistor

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Article information

26 Apr 2016
12 Jul 2016
First published
19 Jul 2016

Analyst, 2016,141, 5571-5576
Article type

A membrane-free cation selective water-gated transistor

T. M. Althagafi, A. F. Al Baroot, S. A. Algarni and M. Grell, Analyst, 2016, 141, 5571
DOI: 10.1039/C6AN00967K

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