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...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	YAMAZOE NOBORU, KUMAZAKI OSAMU, MIURA NORIO, MATSUDA KAZUYUKI, MIWA MASARU, HISHIKI TATSUYA
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	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.