Abstract

This work presents a flexible miniaturized ion-selective sensor consisting of a solid-contact reference electrode (RE) and ion-selective electrodes (ISE) fabricated on the same foil. The flexible ion sensor was based on AgCl electrodes screen printed on polyethylene terephthalate foil. The RE was formed by casting a mixture of plasticized polyvinylchloride (PVC) and KCl on the AgCl electrode. The ISE consisted of a stack of AgCl electrode, cellulose gel layer loaded with 0.1 M KCl, and plasticized PVC based ion-selective membrane containing ionophores. The flexible ion sensor showed a sensitivity close to the Nernstian value in a biological relevant range.

Highlights

  • The aim of this work is to develop an integrated flexible large-scale sensing platform using low cost fabrication techniques for analyzing multiple ions in fluids

  • We introduced an earlier prototype of the miniaturized ion sensors with an integrated hydrogel polyhydroxyethylmethacrylate based reference electrode (RE) for potassium and sodium sensing [3]

  • As KCl dissociates, it provides a stable chloride concentration above the AgCl electrode in the RE, that resulted in stable RE potential after a few seconds after immersion

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Summary

Introduction

The aim of this work is to develop an integrated flexible large-scale sensing platform using low cost fabrication techniques (screen printing and dispensing) for analyzing multiple ions in fluids This low cost flexible platform for monitoring multiple ions sensing could be beneficial to measure and control certain human physiological conditions, like salt intake, physical stress and disease diagnosis [1,2]. We introduced an earlier prototype of the miniaturized ion sensors with an integrated hydrogel polyhydroxyethylmethacrylate (pHEMA) based RE for potassium and sodium sensing [3]. In these sensors, the hydrogel pHEMA was both used as the internal electrolyte for the reference electrode and for the ion-selective electrodes. To slow down the depletion of the chloride concentration in the reference electrode, an O-ring was used to form a reservoir and to increase the pHEMA layer thickness

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