Compact Paper-Based Quasi-Solid-State Organic Electrochemical Transistor (QSS-OECT) for Sensing Hydrogen Peroxide

High Resolution Image Download MS PowerPoint Slide Organic electronics have garnered important attention, as they offer alternatives to classic, more expensive electronic materials and great biocompatibility for building (bio)chemical sensors. Among them, organic electrochemical transistors (OECTs) provide in situ signal amplification, which translates to excellent performance in electrochemical (bio)sensing. This work presents a compact paper-based thick-film quasi-solid-state OECT (QSS-OECT) that integrates the gate and channel in a vertically stacked design. Electrochemical activation by pulsing the gate voltage allows reaching high transconductances of up to 12.4 mS. This system is applied to the detection of H 2 O 2 with a sensitivity of 3.5 ± 0.3 mA/dec. The compact vertical configuration of the device allows for a drastic sample volume reduction, which can be performed with droplets of 1 μL as well as under the flow regime with an open cell configuration. The versatility and high transconductance of this device open new avenues for integration within low-cost sensors and biowearable platforms.