Abstract
Transistor-based ion sensors have evolved significantly, but the best-performing ones rely on a liquid electrolyte as an internal ion reservoir between the ion-selective membrane and the channel. This liquid reservoir makes sensor miniaturization difficult and leads to devices that are bulky and have limited mechanical flexibility, which is holding back the development of high-performance wearable/implantable ion sensors. This work demonstrates microfabricated ion-selective organic electrochemical transistors (OECTs) with a transconductance of 4mS, in which a thin polyelectrolyte film with mobile sodium ions replaces the liquid reservoir. These devices are capable of selective detection of various ions with a fast response time (≈1s), a super-Nernstian sensitivity (85mVdec-1 ), and a high current sensitivity (224µAdec-1 ), comparing favorably to other ion sensors based on traditional and emerging materials. Furthermore, the ion-selective OECTs are stable with highly reproducible sensitivity even after 5 months. These characteristics pave the way for new applications in implantable and wearable electronics.
Highlights
This liquid reservoir makes sensor miniaturization difficult and leads to devices that are bulky and have limited mechanical flexibility, which is holding back the development of high-performance wearable/implantable ion sensors
In agriculture, miniaturized sensors inserted in plants, where analytes from soil are purified, could monitor soil nutrimicrofabricated ion-selective organic electrochemical transistors (OECTs) ents to achieve simultaneous improvewith a transconductance of 4 mS, in which a thin polyelectrolyte film with mobile sodium ions replaces the liquid reservoir
These devices are capable of selective detection of various ions with a fast response time (≈1 s), a super-Nernstian sensitivity (85 mV dec−1), and a high current sensitivity (224 μA dec−1), comparing favorably to other ion sensors based on traditional ments in fertilizer use efficiency and crop yield.[5,10,11]
Summary
Sanggil; Yamamoto, Shunsuke; Polyravas, Anastasios G.; Malliaras, George G. Microfabricated Ion-Selective Transistors with Fast and SuperNernstian Response.
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