Aerobic and anaerobic H^sub 2^ sensing sensors fabricated by diffusion membranes depositing on Pt-ZnO film

Utilizing sensor to detect H2 under different oxygen concentrations is essential in monitoring status of nuclear weapon. A membrane covering on a sensing film could influence the diffusion of oxygen, thus changing the sensing performance of a metal oxide (MOX) gas sensor. In this research, silica an...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2017-11, Vol.B252, p.239
Main Authors: Du, Yan, Gao, Shi, Mao, Zhenghao, Zhang, Chunlei, Zhao, Qifan, Zhang, Shunping
Format: Article
Language:English
Subjects:
Aluminum
Aluminum oxide
Chemical vapor deposition
Detection
Diffusion rate
Gas detectors
Gas sensors
Membranes
MOX
Nuclear weapons
Organic chemistry
Oxygen
Platinum
Sensors
Silicon dioxide
Spray pyrolysis
Ultrasonic testing
Zinc oxide
Zinc oxides
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Summary:Utilizing sensor to detect H2 under different oxygen concentrations is essential in monitoring status of nuclear weapon. A membrane covering on a sensing film could influence the diffusion of oxygen, thus changing the sensing performance of a metal oxide (MOX) gas sensor. In this research, silica and alumina (SiO2/Al2O3) composite membranes were deposited in-situ on Pt-modified ZnO by combining chemical vapor deposition (CVD) and ultrasonic spray pyrolysis (USP) methods Through adjusting the ratio of silicon to aluminum (Si/Al), the composition of membranes, the diffusion rate of oxygen and H2 sensing property under different oxygen concentrations were regulated. With the decrease of the Si/Al ratio, the H2 responses of the sensors increased first and decreased then under high (10,000 ppm) oxygen concentration. While under low (50 ppm) oxygen concentration, the H2 responses of the sensors went down first and rose then. The sensors covered with membranes of high Si/Al ratio exhibited aerobic H2 sensing property. Meanwhile, sensors deposited with membranes of low Si/Al ratio or without membrane showed anaerobic H2 sensing property. This study contributes to further understanding of the influence of oxygen diffusion on MOX sensing properties.
ISSN:0925-4005
1873-3077