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Sensors 2016, 16(10), 1599; doi:10.3390/s16101599

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

1
Group of Electronic Development and Printed Sensors (GEDPS), Centro de Reconocimiento Molecular y Desarrollo Tecnológico, Unidad Mixta UPV-UV, Valencia 46022, Spain
2
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)
View Full-Text   |   Download PDF [2846 KB, uploaded 28 September 2016]   |  

Abstract

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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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

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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