Abstract
The peculiarities in the sensor response to ozone are discussed for SnO 2 thin films. Films with thickness from 30 to 200 nm were deposited by spray pyrolysis. The study of sensor response kinetics and humidity influence on the gas sensing characteristics was used to understand these unique responses. The response to dry (ozone + air) gas of the films was a multiple-step process, reflecting a complex reaction mechanism. The presence of humidity in the surrounding atmosphere made this process still more complicated. It was found that adsorption/desorption of both water and oxygen controlled the kinetics of gas response of the SnO 2-based sensors. Interestingly, higher pyrolysis and operation temperatures both promoted a lowering of the humidity influence on the gas sensor response. This work suggests that the appearance of a slower component in sensor response at higher temperatures, T oper > 400 °C, is connected with the increased influence by diffusion processes in the bulk of the SnO 2 grains, which is consistent with reduction/reoxidation processes.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
