Thin film organic electrochemical transistors based on hybrid PANI/PEDOT:PSS active layers for enhanced pH sensing

We report on organic electrochemical transistors (OECTs) with active channels made of hybrid inkjet-printed poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) and electropolymerized polyaniline (PANI) layers, exhibiting simultaneously improved electrical pH sensing characteristics. The aniline electropolymerization an optimum 6-cycles cyclic voltammetry forms a porous PANI microstructured layer the PEDOT:PSS film, resulting in high signal linearity sensitivity about 100 mV/pH 20 ?A/pH. impedance spectroscopy analysis demonstrates 9X higher-change interfacial capacitance when decreasing PANI-PEDOT:PSS layer, comparison to bare layer. simple fabrication process amplification pave way for flexible higher-performance pH-sensitive OECTs. These scalable devices, combined ion-selective OECTs, would lead novel tool multi-parametric different biofluids. • Hybrid layers are analyzed as detect changes. devices have silver contacts channel, latter. exhibit sensitivities mA/pH. A higher change is measured compared varying pH.