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Sensors 2013, 13(9), 12467-12481; doi:10.3390/s130912467

NO and NO2 Sensing Properties of WO3 and Co3O4 Based Gas Sensors

National Institute of Advanced Industrial Science and Technology (AIST), Advanced Manufacturing Research Institute, 2266-98 Anagahora, Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan
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Received: 23 July 2013 / Revised: 27 August 2013 / Accepted: 11 September 2013 / Published: 17 September 2013
(This article belongs to the Section Chemical Sensors)
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Abstract

Semiconductor-based gas sensors that use n-type WO3 or p-type Co3O4 powder were fabricated and their gas sensing properties toward NO2 or NO (0.5–5 ppm in air) were investigated at 100 °C or 200 °C. The resistance of the WO3-based sensor increased on exposure to NO2 and NO. On the other hand, the resistance of the Co3O4-based sensor varied depending on the operating temperature and the gas species. The chemical states of the surface of WO3 or those of the Co3O4 powder on exposure to 1 ppm NO2 and NO were investigated by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. No clear differences between the chemical states of the metal oxide surface exposed to NO2 or NO could be detected from the DRIFT spectra. View Full-Text
Keywords: gas sensor; metal oxide semiconductor; diffuse reflectance infrared Fourier transform spectroscopy; NO2; NO gas sensor; metal oxide semiconductor; diffuse reflectance infrared Fourier transform spectroscopy; NO2; NO
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Akamatsu, T.; Itoh, T.; Izu, N.; Shin, W. NO and NO2 Sensing Properties of WO3 and Co3O4 Based Gas Sensors. Sensors 2013, 13, 12467-12481.

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