TY - JOUR
T1 - Microfabricated Ion-Selective Transistors with Fast and Super-Nernstian Response
AU - Han, Sanggil
AU - Yamamoto, Shunsuke
AU - Polyravas, Anastasios G.
AU - Malliaras, George G.
N1 - KAUST Repository Item: Exported on 2020-11-04
Acknowledged KAUST grant number(s): OSR-2016-CRG5-3003
Acknowledgements: 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.
PY - 2020/10/29
Y1 - 2020/10/29
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/665785
UR - https://onlinelibrary.wiley.com/doi/10.1002/adma.202004790
UR - http://www.scopus.com/inward/record.url?scp=85094209035&partnerID=8YFLogxK
U2 - 10.1002/adma.202004790
DO - 10.1002/adma.202004790
M3 - Article
C2 - 33118196
SN - 0935-9648
SP - 2004790
JO - Advanced Materials
JF - Advanced Materials
ER -