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Organic-based sensor for chemical detection in aqueous solution
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We present a flexible, pentacene-based field-effect device, for the detection of chemical species in aqueous solution. The sensor consists in a double-gate transistor, where the detection is achieved by exploiting the charge sensing capabilities of the floating-gate terminal. To provide the -sensitivity, the floating gate is functionalized with thioamine groups as such groups protonize proportionally to the concentration of ions in solution. With respect to the existing organic-based devices for monitoring, our sensor does not require a counterelectrode and the organic semiconductor is not affected by the contact with the monitored solution.
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