Microfabricated Ion-Selective Transistors with Fast and Super-Nernstian Response
KAUST Grant NumberOSR-2016-CRG5-3003
Permanent link to this recordhttp://hdl.handle.net/10754/665785
MetadataShow full item record
AbstractTransistor-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 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 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.
CitationHan, S., Yamamoto, S., Polyravas, A. G., & Malliaras, G. G. (2020). Microfabricated Ion-Selective Transistors with Fast and Super-Nernstian Response. Advanced Materials, 2004790. doi:10.1002/adma.202004790
SponsorsThis work was supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award no. OSR-2016-CRG5-3003 and by the Natural Environment Research Council (NERC) under award no. NE/T012293/1.
Except where otherwise noted, this item's license is described as This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.