Microfabricated Ion-Selective Transistors with Fast and Super-Nernstian Response
Type
ArticleKAUST Grant Number
OSR-2016-CRG5-3003Date
2020-10-29Submitted Date
2020-07-14Permanent link to this record
http://hdl.handle.net/10754/665785
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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 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.Citation
Han, 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.202004790Sponsors
This 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.Publisher
WileyJournal
Advanced MaterialsAdditional Links
https://onlinelibrary.wiley.com/doi/10.1002/adma.202004790ae974a485f413a2113503eed53cd6c53
10.1002/adma.202004790
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