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

L. F. Da Silva , J. C. M'Peko , A. C. Catto , S. Bernardini (1) , V. R. Mastelaro , Khalifa Aguir (1) , C. Ribeiro (2) , E. Longo (3)

1 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
2 CCE UFES, Dept Quim, Goiabeiras Vitoria, ES, Brazil
3 LIEC/INCTMN

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.

Mots clés: Hydrothermal; Heterojunction; ZnO; SnO2; UV-light; Ozone sensor

Domaines: Micro et nanotechnologies/Microélectronique

L. F. Da Silva, J. C. M'Peko, A. C. Catto, S. Bernardini, V. R. Mastelaro, et al.. UV-enhanced ozone gas sensing response of ZnO-SnO2 heterojunctions at room temperature. Sensors and Actuators B: Chemical, 2017, 240, pp.573-579. ⟨10.1016/j.snb.2016.08.158⟩. ⟨hal-01633135⟩