Detection and Discrimination Methods of Sub-ppm Nitrogen Dioxide (NO2) with a Copper Oxide Sensor Operated with a Pulsed Temperature Modulation

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Vol. 222, Issue 6, June 2018, pp. 24-30

Detection and Discrimination Methods of Sub-ppm Nitrogen Dioxide (NO₂) with a Copper Oxide Sensor Operated
with a Pulsed Temperature Modulation

¹ Aymen SENDI, ¹ Grérory BESNARD, ¹ Philippe MENINI, ¹ Chaabane TALHI, ¹ Frédéric BLANC, ¹ Bernard FRANC, ² Myrtil KAHAN, ² Katia FAJERWERG and ² Pierre FAU

¹ LAAS-CNRS, University of Toulouse, CNRS, 7 Avenue du Colonel Roche, 31000 Toulouse, France
² LCC-CNRS, University of Toulouse, CNRS, 205 Route de Narbonne, 31000 Toulouse, France
¹ Tel.: +33.5.61.33.62.18, fax: +33.5.61.33.62.08

E-mail: sendi@laas.fr, besnard@laas.fr, menini@laas.fr, talhi@laas.fr, blanc@laas.fr, franc@laas.fr, myrtil.kahn@lcc-toulouse.fr, katia.fajerwerg@lcc-toulouse.fr, pierre.fau@lcc-toulouse.fr

Received: 25 April 2018 /Accepted: 7 June 2018 /Published: 30 June 2018

Abstract: NO₂ is considered among the main pollutants found in atmosphere and indoor air as well. The exposure to this gas is dangerous to human health; its detection is an urgent need that requires the development of efficient and cheap methods and techniques for detection and data processing. In this context, copper oxide is a good candidate metal oxide that is sensitive and selective for NO₂ at sub-ppm concentrations. We used a CuO composed by nanoparticles deposited by inkjet printing technology on a micro hotplate. The optimum detection capacity is obtained thanks to a dedicated temperature modulation. Thanks to this operating mode, we report a simple method for data processing and exploitation in order to obtain a good selectivity for the nitrogen dioxide over few interferent gases. Only four parameters get from sensor response allow us to make an efficient discrimination between individual gases but also in gaseous mixtures in humid atmosphere.

Keywords: NO₂, CuO nanoparticles, Temperature modulation, Gas sensor, Selectivity.

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