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Proceedings 2017, 1(4), 418; doi:10.3390/proceedings1040418

ZnO/SnO2 Heterojunctions Sensors with UV-Enhanced Gas-Sensing Properties at Room Temperature

1
Department of Physics, Federal University of São Carlos, 13565-905 São Carlos, São Paulo, Brazil
2
Laboratory for Multifunctional Materials, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland
3
Institute of Physics of São Carlos, University of São Paulo, 13566-590 São Carlos, São Paulo, Brazil
4
Aix-Marseille University, CNRS, IM2NP 7334, 13397 Marseille, France
5
EMBRPA Instrumentation, 13560-970 São Carlos, São Paulo, Brazil
6
LIEC, Department of Chemistry, Federal University of São Carlos, 13565-905 São Carlos, São Paulo, Brazil
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
*
Author to whom correspondence should be addressed.
Published: 11 August 2017
(This article belongs to the Proceedings of Eurosensors 2017)
Download PDF [572 KB, uploaded 6 September 2017]

Abstract

We report herein the efficiency of microwave-assisted synthesis for obtaining ZnO/SnO2 heterostructures for room-temperature gas-sensing applications. The sensing performances of the traditional oxide materials have been found for applications above 200 °C. However, these temperatures were here reduced to room temperature by considering sensing activity photoactivated by UV light, even for ppb ozone (O3) levels. The heterojunctions exhibited a fast response, total reversibility, and selectivity to oxidizing gases, especially O3 gas. This investigation provides an efficient way to obtain heterostructures exhibiting remarkable properties for practical applications as O3 gas sensor devices.
Keywords: microwave-assisted synthesis; ZnO; SnO2; heterojunction; chemresistors; UV-photoactivated; room-temperature; ozone gas microwave-assisted synthesis; ZnO; SnO2; heterojunction; chemresistors; UV-photoactivated; room-temperature; ozone gas
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Silva, L.F.; Lucchini, M.A.; M’Peko, J.-C.; Bernardini, S.; Aguir, K.; Ribeiro, C.; Longo, E.; Niederberger, M. ZnO/SnO2 Heterojunctions Sensors with UV-Enhanced Gas-Sensing Properties at Room Temperature. Proceedings 2017, 1, 418.

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