UV-enhanced ozone gas sensing response of ZnO-SnO2 heterojunctions at room temperature

Sensors and Actuators B-Chemical Volume: 240 Pages: 573-579 Published: 2017

ZnO − SnO2(50Zn50Sn) heterojunction prepared via hydrothermal treatment. (a) TEM and (b) HRTEM images.

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Writers: Luís F. da Silva and J.-C. M’Peko and Ariadne C. Catto and Sandrine Bernardini and Valmor R. Mastelaro and Khalifa Aguir and Caue Ribeiro and Elson Longo

Keywords: Hydrothermal; Heterojunction; ZnO; SnO2; UV light; Ozone sensor

Abstract: 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.

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