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Real-Time Ozone Sensor Based on Selective Oxidation of Methylene Blue in Mesoporous Silica Films

1
Département de Métrologie des Polluants, Institut National de Recherche et de Sécurité (INRS), 54500 Vandœuvre-lès-Nancy, France
2
Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l’Environnement (LCPME), UMR 7564 CNRS-Université de Lorraine, 405 rue de Vandœuvre, 54600 Villers-lès-Nancy, France
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(16), 3508; https://doi.org/10.3390/s19163508
Received: 9 July 2019 / Revised: 29 July 2019 / Accepted: 8 August 2019 / Published: 10 August 2019
(This article belongs to the Special Issue Gas Sensors and Smart Sensing Systems)
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Abstract

Sensitive and selective personal exposure monitors are needed to assess ozone (O3) concentrations in the workplace atmosphere in real time for the analysis and prevention of health risks. Here, a cumulative gas sensor using visible spectroscopy for real-time O3 determination is described. The sensing chip is a mesoporous silica thin film deposited on transparent glass and impregnated with methylene blue (MB). The sensor is reproducible, stable for at least 50 days, sensitive to 10 ppb O3 (one-tenth of the occupational exposure limit value in France, Swiss, Canada, U.K., Japan, and the USA) with a measurement range tested up to 500 ppb, and insensitive to NO2 and to large variation in relative humidity. A model and its derivative as a function of time are proposed to convert in real time the sensor response to concentrations, and an excellent correlation was obtained between those data and reference O3 concentrations. This sensor is based on a relatively cheap sensing material and a robust detection system, and its analytical performance makes it suitable for monitoring real-time O3 concentrations in workplaces to promote a safer environment for workers. View Full-Text
Keywords: ozone; optical gas sensor; mesoporous silica; methylene blue; occupational exposure ozone; optical gas sensor; mesoporous silica; methylene blue; occupational exposure
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Ghazaly, C.; Hébrant, M.; Langlois, E.; Castel, B.; Guillemot, M.; Etienne, M. Real-Time Ozone Sensor Based on Selective Oxidation of Methylene Blue in Mesoporous Silica Films. Sensors 2019, 19, 3508.

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