Ammonia sensor

US7341694B2 · kind B2 · utility

Assignee

• NGK SPARK PLUG CO., LTD. · US

Inventors

• Hiroyuki Nishiyama · Tokyo, JP
• Shiro Kakimoto · Kasugai, JP
• Ryuji Inoue · Gifu, JP
• Hitoshi Yokoi · Ebeye, US
• Noboru Ishida · Ebeye, US
• Takafumi Oshima · Nagoya, JP
• Satoshi Sugaya · Kounan, JP
• Koichi Imaeda · Ebeye, US
• Tadashi Hattori · Okazaki, JP
• Atsushi Satsuma · Nagoya, JP

Key dates

• Filing date: Sep 25, 2003
• Grant date: Mar 11, 2008
• Expiry date: Dec 31, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T436/25875
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In an ammonia sensor (1), lead portions (7) and (9) are provided on an insulating substrate (5); a pair of comb-shaped electrodes (11) and (13) are connected to the lead portions (7) and (9), respectively; a sensitive layer (15) is provided on the comb-shaped electrodes (11) and (13); and a protective layer (17) is provided on the sensitive layer (15). Particularly, the sensitive layer (15) is formed of a gas-sensitive raw material predominantly containing ZrO2 and containing at least W in an amount of 2 to 40 wt. % as reduced to WO3.