Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 237, Issue -, Pages 54-58Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.06.072
Keywords
Operand DRIFTS; Gas sensing with WO3; Detection of CO and NO2; Effect of humidity
Ask authors/readers for more resources
Semiconducting metal oxide based gas sensors are used in a wide spectrum of fields, ranging from the detection of hazardous gases within the environment to monitoring air quality. WO3 is the second, after SnO2, most commonly used semiconducting metal oxide in commercial gas sensors. Despite its frequent application, the surface reactions responsible for sensing are largely unknown. Here, for the first time, a mechanism for the surface reaction between WO3 and humidity can be concluded from experimental results. DC resistance measurements and operando diffuse reflectance infrared Fourier transform spectroscopy show an oxidation of the WO3 lattice during humidity exposure. The filling of oxygen vacancies by water explains the effects atmospheric humidity has on WO3 based sensors, specifically the increase in resistance, the higher sensor signals to CO and the lower sensor signals to NO2. These findings are a basis for understanding how sensing occurs with WO3 based sensors. (C) 2016 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available