SrSnO3-WO3 as capacitive-type nitrogen oxide sensor for monitoring at high temperature

Tatsumi Ishihara; Hiroki Fujita; Hiroyasu Nishiguchi; Yusaku Takita

doi:10.1016/S0925-4005(99)00416-5

SrSnO₃-WO₃ as capacitive-type nitrogen oxide sensor for monitoring at high temperature

Tatsumi Ishihara, Hiroki Fujita, Hiroyasu Nishiguchi, Yusaku Takita

Research output: Contribution to journal › Conference article › peer-review

29 Citations (Scopus)

Abstract

Capacitive-type NO sensor, which is operable at high temperature, was investigated in this study for monitoring NO in flue gases from a gasoline engine. Oxide capacitor consisting of BaSnO₃ or SrSnO₃ mixed with WO₃ exhibits high sensitivity at temperature higher than 773 K. In particular, mixed oxide capacitor of SrSnO₃-WO₃ exhibited high sensitivity to NO and stable response at high temperatures. Furthermore, the capacitance of SrSnO₃-WO₃ is less sensitive to CO₂, H₂O, and CO compared to NO. Addition of small amount of Pt was effective for improving the response characteristics. Consequently, mixed oxide of SrSnO₃-WO₃ is as promising as the capacitive-type NO sensor operable at high temperatures. The NO adsorption state was further investigated with TPD measurement. It became clear that NO adsorbed on SrSnO₃ was undissociative and two adsorption species exist. In contrast, NO adsorption on WO₃ is dissociative. Addition of Pt was effective for decreasing the desorption temperature of oxygen from WO₃ which was formed by the dissociative adsorption of NO.

Original language	English
Pages (from-to)	319-324
Number of pages	6
Journal	Sensors and Actuators, B: Chemical
Volume	65
Issue number	1
DOIs	https://doi.org/10.1016/S0925-4005(99)00416-5
Publication status	Published - Jun 30 2000
Externally published	Yes
Event	IMCS-7: 7th International Meeting on Chemical Sensors - Beijing, China Duration: Jul 27 1998 → Jul 30 1998

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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title = "SrSnO3-WO3 as capacitive-type nitrogen oxide sensor for monitoring at high temperature",

abstract = "Capacitive-type NO sensor, which is operable at high temperature, was investigated in this study for monitoring NO in flue gases from a gasoline engine. Oxide capacitor consisting of BaSnO3 or SrSnO3 mixed with WO3 exhibits high sensitivity at temperature higher than 773 K. In particular, mixed oxide capacitor of SrSnO3-WO3 exhibited high sensitivity to NO and stable response at high temperatures. Furthermore, the capacitance of SrSnO3-WO3 is less sensitive to CO2, H2O, and CO compared to NO. Addition of small amount of Pt was effective for improving the response characteristics. Consequently, mixed oxide of SrSnO3-WO3 is as promising as the capacitive-type NO sensor operable at high temperatures. The NO adsorption state was further investigated with TPD measurement. It became clear that NO adsorbed on SrSnO3 was undissociative and two adsorption species exist. In contrast, NO adsorption on WO3 is dissociative. Addition of Pt was effective for decreasing the desorption temperature of oxygen from WO3 which was formed by the dissociative adsorption of NO.",

author = "Tatsumi Ishihara and Hiroki Fujita and Hiroyasu Nishiguchi and Yusaku Takita",

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T1 - SrSnO3-WO3 as capacitive-type nitrogen oxide sensor for monitoring at high temperature

AU - Ishihara, Tatsumi

AU - Fujita, Hiroki

AU - Nishiguchi, Hiroyasu

AU - Takita, Yusaku

PY - 2000/6/30

Y1 - 2000/6/30

N2 - Capacitive-type NO sensor, which is operable at high temperature, was investigated in this study for monitoring NO in flue gases from a gasoline engine. Oxide capacitor consisting of BaSnO3 or SrSnO3 mixed with WO3 exhibits high sensitivity at temperature higher than 773 K. In particular, mixed oxide capacitor of SrSnO3-WO3 exhibited high sensitivity to NO and stable response at high temperatures. Furthermore, the capacitance of SrSnO3-WO3 is less sensitive to CO2, H2O, and CO compared to NO. Addition of small amount of Pt was effective for improving the response characteristics. Consequently, mixed oxide of SrSnO3-WO3 is as promising as the capacitive-type NO sensor operable at high temperatures. The NO adsorption state was further investigated with TPD measurement. It became clear that NO adsorbed on SrSnO3 was undissociative and two adsorption species exist. In contrast, NO adsorption on WO3 is dissociative. Addition of Pt was effective for decreasing the desorption temperature of oxygen from WO3 which was formed by the dissociative adsorption of NO.

AB - Capacitive-type NO sensor, which is operable at high temperature, was investigated in this study for monitoring NO in flue gases from a gasoline engine. Oxide capacitor consisting of BaSnO3 or SrSnO3 mixed with WO3 exhibits high sensitivity at temperature higher than 773 K. In particular, mixed oxide capacitor of SrSnO3-WO3 exhibited high sensitivity to NO and stable response at high temperatures. Furthermore, the capacitance of SrSnO3-WO3 is less sensitive to CO2, H2O, and CO compared to NO. Addition of small amount of Pt was effective for improving the response characteristics. Consequently, mixed oxide of SrSnO3-WO3 is as promising as the capacitive-type NO sensor operable at high temperatures. The NO adsorption state was further investigated with TPD measurement. It became clear that NO adsorbed on SrSnO3 was undissociative and two adsorption species exist. In contrast, NO adsorption on WO3 is dissociative. Addition of Pt was effective for decreasing the desorption temperature of oxygen from WO3 which was formed by the dissociative adsorption of NO.

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DO - 10.1016/S0925-4005(99)00416-5

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SP - 319

EP - 324

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

SN - 0925-4005

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T2 - IMCS-7: 7th International Meeting on Chemical Sensors

Y2 - 27 July 1998 through 30 July 1998

ER -

SrSnO₃-WO₃ as capacitive-type nitrogen oxide sensor for monitoring at high temperature

Abstract

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