AUTHOR=Wu Yi , Yan Meng , Tian Chen , Liu Yuhang , Hua Zhongqiu 

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

JOURNAL=Frontiers in Chemistry

VOLUME=7

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00907

DOI=10.3389/fchem.2019.00907

ISSN=2296-2646

ABSTRACT=<p>Gas sensors were fabricated from Cr<sub>2</sub>WO<sub>6</sub> nanoparticles for NO<sub>2</sub> detection. Low dimensional materials Cr<sub>2</sub>WO<sub>6</sub> were prepared by a wet chemistry method followed by hydrothermal treatment. The morphology of the nanoparticles and their sensing properties to NO<sub>2</sub> 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<sub>2</sub> 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<sub>2</sub>WO<sub>6</sub> in the absence and presence of NO<sub>2</sub> and water vapor separately. Based on the power law response, it was indicated that both NO<sub>2</sub> and water vapor have a strong adsorption ability than oxygen ions of Cr<sub>2</sub>WO<sub>6</sub> sensors.</p>