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Gas sensors were fabricated from Cr 2 WO 6  nanoparticles for NO 2  detection. Low dimensional materials Cr 2 WO 6  were prepared by a wet chemistry method followed by hydrothermal treatment. The morphology of the nanoparticles and their sensing properties to NO 2  were investigated in both dry and humid conditions. Additionally, the sensing response was also characterized in a non-oxygen condition. It was concluded that the sensor responses in N 2  conditions were higher than that in air conditions at 200°C. Moreover, the sensing characteristics were inhibited by water vapor at 200°C. The oxygen adsorption behavior was also investigated to verify the basic sensing mechanism of Cr 2 WO 6  in the absence and presence of NO 2  and water vapor separately. Based on the power law response, it was indicated that both NO 2  and water vapor have a strong adsorption ability than oxygen ions of Cr 2 WO 6  sensors.

NO2 Sensing Properties of Cr2WO6 Gas Sensor in Air and N2 Atmospheres