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 and pH sensing characteristics. The aniline electropolymerization with an optimum 6-cycles of cyclic voltammetry forms a porous PANI microstructured layer on the PEDOT:PSS film, resulting in high signal linearity and sensitivity of about 100 mV/pH and 20 μA/pH. The electrochemical impedance spectroscopy analysis demonstrates a 9X higher-change of interfacial capacitance when decreasing the pH with the hybrid PANI-PEDOT:PSS layer, in comparison to a bare PEDOT:PSS layer. The simple fabrication process and the high signal amplification pave the way for flexible and higher-performance pH-sensitive OECTs. These scalable devices, combined with ion-selective OECTs, would lead to a novel tool for multi-parametric analysis in different biofluids.

我们报道了由混合喷墨印刷的聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT：PSS）和电聚合聚苯胺（PANI）层制成的具有主动通道的有机电化学晶体管（OECTs），它们同时显示出改善的电和pH感测特性。苯胺电聚合具有最佳的6个循环伏安循环，可在PEDOT：PSS膜上形成多孔PANI微结构化层，从而获得高信号线性度和约100 mV / pH和20μA/ pH的灵敏度。电化学阻抗谱分析表明，与裸PEDOT：PSS层相比，使用混合PANI-PEDOT：PSS层降低pH时，界面电容的变化高9倍。简单的制造过程和高信号放大率为灵活和高性能的pH敏感型OECT铺平了道路。这些可扩展的设备与离子选择性OECT结合使用，将为在不同生物流体中进行多参数分析提供一种新颖的工具。