Enhanced Lifetime and Adhesion of K+‐, NH 4 + ‐, and Ca2+‐Sensitive Membranes on Solid Surfaces Using Hydroxyl‐Modified Polyvinylchloride Matrices

1 October 1988

journal article
Published by The Electrochemical Society in Journal of the Electrochemical Society

Vol. 135 (10) , 2473-2478
https://doi.org/10.1149/1.2095361

Abstract

Liquid‐liquid junction membranes prepared from a modified Polyvinylchloride (PVC) polymer with 0.6 weight percent (w/o) OH introduced, (PVC‐OH) and 0.25 w/o added during casting have substantially enhanced adhesion on glass or Si compared to PVC‐based membranes. Ion‐selective electrodes for based on a dioctyladipate/nonactin ion exchanger show enhanced adhesion, as do Ca²⁺ membranes using a neutral ion carrier/o‐nitrophenyloctylether mixture. Enhanced surface adhesion is demonstrated to result in improved lifetime for K⁺‐sensitive membranes coated on n‐Si electrodes and on ion‐sensitive field effect transistors (ISFET's). Electron micrographs show large differences in surface quality for PVC vs. membranes after aqueous storage.

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