Patent ID: 8603825

Claim:
A sensor for measuring gas permeability of a test material, comprising: an electrically conductive sensing element that comprises a water and/or oxygen sensitive material, wherein the reaction of said material with water or oxygen when the sensing element is contacted with water and/or oxygen results in a change in the electrical conductivity of the sensing element, wherein the water and/or oxygen sensitive material is selected from the group consisting of metals of Group I of the periodic system of elements, metals of Group II of the periodic system of elements, iron, tin, chromium, conductive polymers, and mixtures and combinations thereof; two electrodes electrically connected to the sensing element; a base substrate that supports the sensing element, wherein the electrodes are located on a surface of the substrate, wherein the electrodes are spaced apart, thereby forming a trench, wherein edges of the trench are defined by the edge of each electrode and the base of the trench is the base substrate, wherein the sensing element is located in the trench; and a liner layer interdisposed between the sensing element and the base substrate, wherein the liner layer adjoins the sensing element, and wherein the liner layer comprises an organic polymer and/or an inorganic polymer.