Fig. 6: Complementary channel pOECT for exclusive turn-ON operation.
From: Reconfiguration of organic electrochemical transistors for high-accuracy potentiometric sensing
a Top: a visual representation of the complementary channel pOECT. The GS is kept in a separate electrolyte with a varying pH, while the channel and GG are in a second chamber with an electrolyte of constant composition (1× PBS). Two Ag/AgCl electrodes are used as floating gates to connect the two chambers. Bottom: a schematic of the setup where each channel is operated using the same GS and GG and has its independent drain voltage (VDS1, VDS2) and gate voltage (VSG1, VSG2). The dashed lines represent the high-impedance connections of the potentiostat. The floating gate is not represented. b The transfer curves of the n-type (left) and p-type (right) pOECT when the GS is exposed to electrolytes with different pH values. The inset reports the electrochemical potential of the GS during the measurement, demonstrating the maintained Nernstian response. c Normalized response of the n-type pOECT, the p-type pOECT, and the conventional 2-electrode setup to varying pH values. The error bars correspond to the standard deviation of 3 measurements.
