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Sensors 2017, 17(3), 570; doi:10.3390/s17030570

Concentric-Electrode Organic Electrochemical Transistors: Case Study for Selective Hydrazine Sensing

Institut d’Electronique, Micro-électronique et Nanotechnologie, CNRS, CS 60069, Avenue Poincaré, 59652 Villeneuve d’Ascq CEDEX, France
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Academic Editors: Christos Riziotis, Evangelos Hristoforou and Dimitrios Vlachos
Received: 9 January 2017 / Revised: 27 February 2017 / Accepted: 9 March 2017 / Published: 11 March 2017
(This article belongs to the Special Issue Materials and Applications for Sensors and Transducers)
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Abstract

We report on hydrazine-sensing organic electrochemical transistors (OECTs) with a design consisting of concentric annular electrodes. The design engineering of these OECTs was motivated by the great potential of using OECT sensing arrays in fields such as bioelectronics. In this work, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)-based OECTs have been studied as aqueous sensors that are specifically sensitive to the lethal hydrazine molecule. These amperometric sensors have many relevant features for the development of hydrazine sensors, such as a sensitivity down to 10−5 M of hydrazine in water, an order of magnitude higher selectivity for hydrazine than for nine other water-soluble common analytes, the capability to entirely recover its base signal after water flushing, and a very low operation voltage. The specificity for hydrazine to be sensed by our OECTs is caused by its catalytic oxidation at the gate electrode, and enables an increase in the output current modulation of the devices. This has permitted the device-geometry study of the whole series of 80 micrometric OECT devices with sub-20-nm PEDOT:PSS layers, channel lengths down to 1 µm, and a specific device geometry of coplanar and concentric electrodes. The numerous geometries unravel new aspects of the OECT mechanisms governing the electrochemical sensing behaviours of the device—more particularly the effect of the contacts which are inherent at the micro-scale. By lowering the device cross-talk, micrometric gate-integrated radial OECTs shall contribute to the diminishing of the readout invasiveness and therefore further promote the development of OECT biosensors. View Full-Text
Keywords: OECT; PEDOT:PSS; hydrazine sensor; organic electronics; microelectronics OECT; PEDOT:PSS; hydrazine sensor; organic electronics; microelectronics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Pecqueur, S.; Lenfant, S.; Guérin, D.; Alibart, F.; Vuillaume, D. Concentric-Electrode Organic Electrochemical Transistors: Case Study for Selective Hydrazine Sensing. Sensors 2017, 17, 570.

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