Thick film sensor for hydrogen and carbon monoxide
AssigneeWestinghouse Electric Corp.
InventorsLymperios N. Yannopoulos, Chikara Hirayama
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Abstract
An improved thick film stannic oxide sensor is disclosed whereby the sensitivity of the sensor to CO is enhanced by the addition of a rare earth oxide to the sensor composition and the catalytic reactivity of the sensor, when contacted by a gas containing a reducing constituent, i.e., H.sub.2 or CO, and oxygen, is enhanced by employing RuCl.sub.3 or PtCl.sub.2 as a catalyst.
Claims4
A method of preparing a stannic oxide gas detecting film device responsive primarily to H.sub.2 present in an oxygen containing gas environment, comprising the steps of,
- solution precipitation of Sn(SO.sub.4).sub.2 and SnO.sub.2,
- thermally decomposing the Sn(SO.sub.4).sub.2 to SnO.sub.2,
- adding the SnO.sub.2 to a catalyst solution of acetone or ethanol,
- adding a sintering agent to the catalyst solution containing SnO.sub.2 and stirring,
- filtering the resulting catalyst dopeed oxide mixture,
- drying the filtered mixture to produce a dry powder,
- mixing the resulting dry powder with .beta.-terpineol to form a paste,
- applying the paste to a non-conductive substrate, and
- drying the paste to form a stannic oxide gas detecting film.
A method of preparing a stannic oxide gas detecting film device responsive primarily to CO present in an oxygen containing gas environment, comprising the steps of,
- solution precipitation of Sn(SO.sub.4).sub.2 and SnO.sub.2,
- thermally decomposing the Sn(SO.sub.4).sub.2 to SnO.sub.2,
- adding the SnO.sub.2 to a catalyst solution of acetone or ethanol,
- adding a sintering agent to the catalyst solution containing SnO.sub.2 and stirring,
- filtering the resulting catalyst doped oxide mixture,
- drying the filtered mixture to produce a dry powder,
- adding La.sub.2 O.sub.3 to the dried powder,
- sintering the mixture of the La.sub.2 O.sub.3 and the dry powder;
- mixing the sintered mixture of La.sub.2 O.sub.3 and dry powder with .beta.-terpineol to form a paste,
- applying the paste to a non-conductive substrate, and
- drying the paste to form a stannic oxide gas detecting film.
Dependencies are inferred from the claim text.