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Differentiating NO2 and O3 at Low Cost Air Quality Amperometric Gas Sensors

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Alphasense Ltd, Sensor Technology House, 300 Avenue West, Great Notley, Essex CM77 7AA, United Kingdom
Cite this: ACS Sens. 2016, 1, 11, 1291-1294
Publication Date (Web):October 28, 2016
https://doi.org/10.1021/acssensors.6b00603
Copyright © 2016 American Chemical Society
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Abstract

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This study deals with the differentiation and quantification of both nitrogen dioxide and ozone at ppb level when using amperometric gas sensors. We investigate, here, the addition of a layer of MnO2 microparticles powder as a chemical filter for ozone in a commercial amperometric gas sensor. Experimental results show that a sensor equipped with an MnO2 powder filter is insensitive to O3 but gives a well-defined limited current signal when exposed to NO2. In contrast, an unfiltered sensor senses both gases with a defined sensitivity for each gas. We find that the use of a pair of sensors, with one of the sensors filtered and one unfiltered, allows the quantification of both O3 and NO2. However, the MnO2 filter confers some indirect NO cross-sensitivity to the filtered sensors. Further studies show that it is possible to minimize this unwanted cross-sensitivity by replacing the MnO2 microparticles powder filter by an MnO2/PTFE microparticle composite filter powder. We find that the developed sensors allow reproducible measurements, linear output with the concentration and significant O3 filter capacity for an extended period of time.

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