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Sensors 2016, 16(10), 1599;

Characterization of Screen-Printed Organic Electrochemical Transistors to Detect Cations of Different Sizes

Group of Electronic Development and Printed Sensors (GEDPS), Centro de Reconocimiento Molecular y Desarrollo Tecnológico, Unidad Mixta UPV-UV, Valencia 46022, Spain
Dipartimento di Ingegneria Elettrica ed Elettronica, Università di Cagliari, Piazza d’ Armi, Cagliari 09123, Italy
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 5 July 2016 / Revised: 9 September 2016 / Accepted: 14 September 2016 / Published: 28 September 2016
(This article belongs to the Section Chemical Sensors)
Full-Text   |   PDF [2846 KB, uploaded 28 September 2016]   |  


A novel screen-printing fabrication method was used to prepare organic electrochemical transistors (OECTs) based on poly(3,4-ethylenedioxythiophene) doped with polysterene sulfonate (PEDOT:PSS). Initially, three types of these screen-printed OECTs with a different channel and gate areas ratio were compared in terms of output characteristics, transfer characteristics, and current modulation in a phosphate buffered saline (PBS) solution. Results confirm that transistors with a gate electrode larger than the channel exhibit higher modulation. OECTs with this geometry were therefore chosen to investigate their ion-sensitive properties in aqueous solutions of cations of different sizes (sodium and rhodamine B). The effect of the gate electrode was additionally studied by comparing these all-PEDOT:PSS transistors with OECTs with the same geometry but with a non-polarizable metal gate (Ag). The operation of the all-PEDOT:PSS OECTs yields a response that is not dependent on a Na+ or rhodamine concentration. The weak modulation of these transistors can be explained assuming that PEDOT:PSS behaves like a supercapacitor. In contrast, the operation of Ag-Gate OECTs yields a response that is dependent on ion concentration due to the redox reaction taking place at the gate electrode with Cl counter-ions. This indicates that, for cation detection, the response is maximized in OECTs with non-polarizable gate electrodes. View Full-Text
Keywords: organic electrochemical transistors; screen-printing; PEDOT:PSS; large-size cations organic electrochemical transistors; screen-printing; PEDOT:PSS; large-size cations

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Contat-Rodrigo, L.; Pérez-Fuster, C.; Lidón-Roger, J.V.; Bonfiglio, A.; García-Breijo, E. Characterization of Screen-Printed Organic Electrochemical Transistors to Detect Cations of Different Sizes. Sensors 2016, 16, 1599.

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