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- Title
NO and NO<sub>2</sub> Sensing Properties of WO<sub>3</sub> and Co<sub>3</sub>O<sub>4</sub> Based Gas Sensors.
- Authors
Takafumi Akamatsu; Toshio Itoh; Noriya Izu; Woosuck Shin
- 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.
- Subjects
DETECTORS; NITROGEN oxides; METAL oxide semiconductors; FOURIER transform spectroscopy; METALLIC oxide spectra; SPECTRUM analysis
- Publication
Sensors (14248220), 2013, Vol 13, Issue 9, p12468
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s130912467