Journal
ORGANIC ELECTRONICS
Volume 14, Issue 1, Pages 156-163Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2012.10.027
Keywords
Dopamine; EGOFET; Diagnostic applications
Funding
- EU-project I-ONE [NMP4-SL-2012-280772]
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We describe a potentiometric sensor based on Electrolyte-Gated Organic Field-Effect Transistor (EGOFET) for in vitro'' detection of dopamine. The sensing element of this device resides at the Au gate-aqueous solution interface by means of a self-assembled monolayer (SAM) composed by cysteamine and 4-formylphenyl boronic acid. The covalent and selective adsorption of dopamine induces a surface dipole potential which shifts the electrode work function and modulates the double layer capacitance. As a result, our device is capable to detect dopamine up to pico-molar concentration showing higher sensitivity with respect to other approaches. For this reason the interface engineering of our EGOFET gate is a promising route for diagnostic applications. (c) 2012 Elsevier B.V. All rights reserved.
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