United States of America as Represented by the Administrator of Nasa

Benjamin J Ward

Gary W Hunter

Chung Chiun Liu

Jennifer C Xu

A gas sensor includes a substrate and a pair of interdigitated metal electrodes selected from the group consisting of Pt, Pd, Au, Ir, Ag, Ru, Rh, In, and Os. The electrodes each include an upper surface. A first solid electrolyte resides between the interdigitated electrodes and partially engages the upper surfaces of the electrodes. The first solid electrolyte is selected from the group consisting of NASICON, LISICON, KSICON, and &#x3b2;&#x2033;-Alumina (beta prime-prime alumina in which when prepared as an electrolyte is complexed with a mobile ion selected from the group consisting of Na, K, Li, Ag, H, Pb, Sror Ba). A second electrolyte partially engages the upper surfaces of the electrodes and engages the first solid electrolyte in at least one point. The second electrolyte is selected from the group of compounds consisting of Na, K, Li, Ag, H, Pb, Sror Baions or combinations thereof.

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Northfield Center, OH, United States of America

Benjamin J Ward