GAS SENSOR

GAS SENSOR

PROBLEM TO BE SOLVED: To measure the concentration of ammonia or the like accurately and precisely while eliminating the effect of other gas components by employing WO3 as the main metal oxide of a semiconductor layer and adding a specified quantity of MoO3 thereto. SOLUTION: An electrode 2 is forme...

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Hauptverfasser: YAMAZOE NOBORU, KUMAZAKI OSAMU, MIURA NORIO, MATSUDA KAZUYUKI, MIWA MASARU, HISHIKI TATSUYA
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Sprache:eng
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INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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creator YAMAZOE NOBORU
KUMAZAKI OSAMU
MIURA NORIO
MATSUDA KAZUYUKI
MIWA MASARU
HISHIKI TATSUYA
description PROBLEM TO BE SOLVED: To measure the concentration of ammonia or the like accurately and precisely while eliminating the effect of other gas components by employing WO3 as the main metal oxide of a semiconductor layer and adding a specified quantity of MoO3 thereto. SOLUTION: An electrode 2 is formed by winding a pair of Pt wires around an alumina tube 1. A metal oxide semiconductor layer 3 comprises a porous sintered body formed to wrap the electrode 2. WO3 is employed as the main metal oxide of the semiconductor layer 3 MoO3 is added thereto. This arrangement prevents accurate detection of ammonia from being disabled by the effect of NOx or COx gas coexisting with ammonia in a gas to be detected when a noble metal, e.g. Pt or Au, is added. Preferably, MoO3 is added by 20wt.% or more. When it is added less than 20wt.%, effect of other gas can not be blocked sufficiently.
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SOLUTION: An electrode 2 is formed by winding a pair of Pt wires around an alumina tube 1. A metal oxide semiconductor layer 3 comprises a porous sintered body formed to wrap the electrode 2. WO3 is employed as the main metal oxide of the semiconductor layer 3 MoO3 is added thereto. This arrangement prevents accurate detection of ammonia from being disabled by the effect of NOx or COx gas coexisting with ammonia in a gas to be detected when a noble metal, e.g. Pt or Au, is added. Preferably, MoO3 is added by 20wt.% or more. 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subjects INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
title GAS SENSOR
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