Abstract
The paper investigates the gas response of nanocrystalline SnO 2 based thick film sensors upon exposure to carbon monoxide (CO) in changing water vapour (H 2O) and oxygen (O 2) backgrounds. The sensing materials were undoped, Pt- and Pd-doped SnO 2. We found that in the absence of oxygen, the sensor signal (defined as the ratio between the resistance in the background gas, R 0 and the resistance in the presence of the target gases, R, namely R 0/ R) have the highest values. These values are higher for doped materials than for the undoped ones. The presence of humidity increases dramatically the sensor signal of the doped materials. In the presence of oxygen, the sensor signal decreases significantly for all sensor materials. The results indicate that there is a competitive adsorption between O 2 and H 2O related surface species and, as a result, different sensing mechanisms can be observed for CO.
Sign-in/Register to access full text options 
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.
