UV-enhanced ozone gas sensing response of ZnO-SnO^sub 2^ heterojunctions at room temperature

The sensitivity of ZnO-SnO2 heterojunctions to ozone gas was investigated in this work, the two-phase materials of which were prepared via a hydrothermal route, resulting in nanocomposites in which the formation of heterojunctions was confirmed by microscopy analyses. While the sensing effectiveness...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2017-03, Vol.B240, p.573
Main Authors: da Silva, Luís F, M’Peko, J-C, Catto, Ariadne C, Bernardini, Sandrine, Mastelaro, Valmor R, Aguir, Khalifa, Ribeiro, Caue, Longo, Elson
Format: Article
Language:English
Subjects:
Detection
Environmental monitoring
Gas sensors
Gases
Heterojunctions
Nanocomposites
Ozone
Recovery time
Room temperature
Semiconductors
Sensors
Tin dioxide
Two phase materials
Ultraviolet radiation
Zinc oxide
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Summary:The sensitivity of ZnO-SnO2 heterojunctions to ozone gas was investigated in this work, the two-phase materials of which were prepared via a hydrothermal route, resulting in nanocomposites in which the formation of heterojunctions was confirmed by microscopy analyses. While the sensing effectiveness of these materials is currently verified for application above 150 °C, these temperatures are here drastically reduced to room temperature by considering sensing activity under continuous UV irradiation, even for ozone concentrations as low as 20 ppb. This approach resulted in a fast sensing response, a short recovery time and a good selectivity compared to other gases, demonstrating a great potential of such heterojunctions for applications in environmental monitoring devices.
ISSN:0925-4005
1873-3077