Patent ID: 6555159
Filing Date: 2003-04-29
Classification: C23C,G01N

Abstract:
A method for making a sensor, comprising:disposing an electrolyte between a first side of sensing electrode and a first side of reference electrode, wherein said sensing electrode has a first electrical lead in electrical communication with said sensing electrode, and wherein said reference electrode has a second electrical lead in electrical communication with said reference electrode disposing a first side of a protective layer adjacent to a second side of said sensing electrode; applying a mixture of a metal oxide, a solvent, and a fugitive material selected from the group consisting of carbon black, graphite, non-dissolved organics and combinations comprising at least one of the foregoing materials, to a second side of said protective layer; and calcining said applied mixture to form a protective coating on said second side of said protective layer; wherein said protective coating has a thickness of greater than about 120 &mgr;m.