Solid-state sodium-selective sensors based on screen-printed Ag/AgCl reference electrodes

S. Walsh, D. Diamond, J. McLaughlin, E. McAdams, David Woolfson, David Jones, M. Bonner

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


The potentiometric and AC impedance characteristics of all solid-state sodium-selective electrodes based on planar screen-printed Ag/AgCl electrodes are described. Two solid-state designs have been investigated. The first was based on the deposition of a sodium-selective PVC membrane directly on top of a screen-printed Ag/AgCl electrode, The second design included a NaCl doped hydrogel layer, between the PVC and Ag\AgCl layers. The hydrogel provides a mechanism to relieve any blockage to charge transfer occurring when PVC membranes are used directly on top of Ag/AgCl and also improves adhesion between the two layers. Results suggest the electrodes display Fast ion exchange kinetics, low noise and drift. The performance compares favorably to that of a conventional ion-selective electrode with internal filling solution.
Original languageEnglish
Pages (from-to)1318-1324
Number of pages7
Publication statusPublished - 1997

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