US 5,344,547 A · Polycrystalline ion selective electrode

Abstract

An improved "all solid state" ion selective electrode device comprising a unique sensing element of triple-layer membrane construction. The first sensor layer of the sensing membrane comprising a solid electrolyte composition, the middle layer comprising a mixture of the aforesaid electrolyte composition and finely divided electronic conducting material, and the third contacting layer composed principally of the aforesaid electronic conducting material. The middle layer having a gradient of component concentration such that a substantial amount of the electrolyte composition is presented in the middle layer closest the first sensor layer and a substantial amount of the electronic conducting material is presented in the middle layer closest the third contacting layer.

Claims25

Dependent claims

A polycrystalline membrane for the detection of an ionic species in solution, said membrane comprising:

a first sensor layer composed of a solid electrolyte composition possessing ionic conductivity;
a second middle layer comprising a mixture of said solid electrolyte composition and an electronic conducting material, whereby said middle layer has a gradient of component concentration such that a greater amount of said electrolyte composition is presented in said middle layer closest said sensor layer than is presented near said third contacting layer, and a greater amount of said electronic conducting material is presented in said middle layer closest said third contacting layer than is presented near said first contacting layer;
and
a third electrical contacting layer comprising said electronic conducting material.

1 more element

Dependencies are inferred from the claim text.

Polycrystalline ion selective electrode

Life of this patent

Polycrystalline ion selective electrode

Life of this patent

Abstract

Claims25