Zeolite-modified WO₃ gas sensors – Enhanced detection of NO

Solid-state metal oxide gas sensors with zeolite overlayers have been developed as a means to improve sensor selectivity. Screen printed tungsten oxide (WO₃) sensors were modified by the addition of acidic and catalytic zeolite layers. The sensors were characterised before and after sensing experime...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2011, Vol.160 (1), p.475-482
Main Authors: Varsani, Priya, Afonja, Ayo, Williams, David E, Parkin, Ivan P, Binions, Russell
Format: Article
Language:English
Subjects:
electronic nose
energy-dispersive X-ray analysis
gases
nitrogen dioxide
scanning electron microscopy
tungsten
X-ray diffraction
zeolites
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Summary:Solid-state metal oxide gas sensors with zeolite overlayers have been developed as a means to improve sensor selectivity. Screen printed tungsten oxide (WO₃) sensors were modified by the addition of acidic and catalytic zeolite layers. The sensors were characterised before and after sensing experiments using X-ray diffraction, energy dispersive X-ray analysis and scanning electron microscopy. The sensors were tested against various gases and gas mixtures to assess their discriminatory behaviour. The results show that the sensors response can be tailored to be selective towards specific target gases by changing the zeolite; for example the H-ZSM-5 sensor gave a response 19 times greater to NO₂ than an unmodified control sensor. It was observed that the WO₃ based gas sensors showed a remarkable selectivity towards NO₂ in a gas mixture. The sensors also showed high levels of stability and sensitivity and have potential to be used in electronic nose technology.
ISSN:0925-4005
1873-3077