Fully Passive Electrochemical Oxygen Sensor Enabled With Organic Electrochemical Transistor

• DOI: 10.1002/admt.202401875
• Publication Date: 2025-02-03T07:29:51Z
• Authors: Lia Giulia D'Amico; Chenhong Zhang; Francesco Decataldo; Vito Vurro; Marta Tessarolo; Isacco Gualandi; Federica Mariani; Erika Scavetta; Tobias Cramer; Beatrice Fraboni
• Keywords: Oxygen sensor; Electrochemical gas sensor

Abstract Wireless and battery‐free sensor operation is essential for sustainable networks environmental health monitoring. Achieving such a fully passive design in electrochemical sensors challenging due to the need amplification control electronics as realized potentiostats. To address this issue, organic transistors (OECTs) are introduced amplified demonstrate an OECT‐based oxygen that exploits reduction of oxygen, akin Clark electrode. build sensor, transistor thin film fabrication protocol integrated with deposition gas permeable silicone membrane hydrogel electrolyte. assess sensor's power consumption, model links consumption OECT geometry material properties semiconducting channel established. This identifies optimized compatible commercial near‐field communication (NFC) microcontrollers. In design, interrogating NFC radio signal sufficient microcontroller, achieve readout, transmit digitized current, enabling monitoring air or water without wired connections batteries. These findings provide first example quantitative argumentation on exploiting OECTs low‐power architectures.