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

Sensors and Actuators B 240 (2017) 573–579

Fig.: ZnO − SnO2 (50Zn50Sn) hetero junction prepared via hydrothermal treatment. (a) TEM and (b) HRTEM images.

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Writers: Luís F. da Silvaa, J.-C. M’Pekob, Ariadne C. Catto, Sandrine Bernardini,Valmor R. Mastelaro, Khalifa Aguir, Caue Ribeiro, 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, evenfor ozone concentrations as low as 20 ppb. This approach resulted in a fast sensing response, a shortrecovery time and a good selectivity compared to other gases, demonstrating a great potential of suchheterojunctions for applications in environmental monitoring devices.

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