Organic Electrochemical Transistors (OECTs) are widely investigated for application in bioelectronics. Ionic liquids (ILs) are, in principle, interesting candidates as gating media in OECTs. Nevertheless, ILs can exhibit excessively high viscosity that prevents their straightforward application in OECTs. Here we report two processing approaches to apply the highly viscous ionic liquid triisobutyl(methyl)phosphonium tosylate (Cyphos IL 106) in OECTs based on poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS), namely IL/H2O binary mixtures and ion gels. The use of CyphosÒ IL 106/H2O binary mixtures and ion gels as gating media determines an increase of the OECT modulation, with respect to the pure ionic liquid. This increase cannot be explained simply by the change of the viscosity and ionic conductivity of the ionic liquid/H2O mixtures with the increase of the H2O content. Using high surface area activated carbon gates, ON/OFF ratios as high as 5000 are achieved with CyphosÒ IL 106/H2O mixtures at 5 and 10% H2O v/v.
Ionic liquid-water mixtures and ion gels as electrolytes for organic electrochemical transistors / Yi, Z.; Natale, G.; Kumar, P.; Di Mauro, E.; Heuzey, M.-C.; Soavi, F.; Perepichka, I.I.; Varshney, S.K.; Santato, C.; Cicoira, F.. - In: JOURNAL OF MATERIALS CHEMISTRY. C. - ISSN 2050-7534. - STAMPA. - 3:25(2015), pp. 6549-6553. [10.1039/c5tc00712g]
Ionic liquid-water mixtures and ion gels as electrolytes for organic electrochemical transistors
SOAVI, FRANCESCA;
2015
Abstract
Organic Electrochemical Transistors (OECTs) are widely investigated for application in bioelectronics. Ionic liquids (ILs) are, in principle, interesting candidates as gating media in OECTs. Nevertheless, ILs can exhibit excessively high viscosity that prevents their straightforward application in OECTs. Here we report two processing approaches to apply the highly viscous ionic liquid triisobutyl(methyl)phosphonium tosylate (Cyphos IL 106) in OECTs based on poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS), namely IL/H2O binary mixtures and ion gels. The use of CyphosÒ IL 106/H2O binary mixtures and ion gels as gating media determines an increase of the OECT modulation, with respect to the pure ionic liquid. This increase cannot be explained simply by the change of the viscosity and ionic conductivity of the ionic liquid/H2O mixtures with the increase of the H2O content. Using high surface area activated carbon gates, ON/OFF ratios as high as 5000 are achieved with CyphosÒ IL 106/H2O mixtures at 5 and 10% H2O v/v.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
