Manufacturing of Flexible, Impedimetric Potassium Sensors

In this letter, a cost-effective, flexible, and fully printable potassium ion (K+) sensor is developed. The sensor consists of two interdigitated gold electrodes covered by a butylacrylate potassium ion-sensitive membrane (ISM). An impedimetric measurement method is chosen to eliminate the need for a reference electrode and to reduce signal drifting. We show the versatility and high reproducibility of the manufacturing process and present first measurement results. Our sensors achieve a sensitivity of 4.553 MΩ/(mmol/L) at 100 mHz and an accuracy of 1.8 mmol/L. The sensors exhibit low cross sensitivity toward sodium ions and show no signal drift.