Characterization of Screen-Printed Organic Electrochemical Transistors to Detect Cations of Different Sizes
AbstractA 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
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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.
Contat-Rodrigo L, Pérez-Fuster C, Lidón-Roger JV, Bonfiglio A, García-Breijo E. Characterization of Screen-Printed Organic Electrochemical Transistors to Detect Cations of Different Sizes. Sensors. 2016; 16(10):1599.Chicago/Turabian Style
Contat-Rodrigo, Laura; Pérez-Fuster, Clara; Lidón-Roger, José V.; Bonfiglio, Annalisa; García-Breijo, Eduardo. 2016. "Characterization of Screen-Printed Organic Electrochemical Transistors to Detect Cations of Different Sizes." Sensors 16, no. 10: 1599.
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