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Sensors 2018, 18(3), 740; https://doi.org/10.3390/s18030740

Optical Fibre NO2 Sensor Based on Lutetium Bisphthalocyanine in a Mesoporous Silica Matrix

1
Service de Science des Matériaux, Faculté Polytechnique, Université de Mons, 7000 Mons, Belgium
2
Materia Nova, Materials R&D Centre, Parc Initialis, Avenue Nicolas Copernic 1, 7000 Mons, Belgium
3
Service d’Electromagnétisme et de Télécommunications, Faculté Polytechnique, Université de Mons, 7000 Mons, Belgium
4
Institut de Chimie Moléculaire de l’Université de Bourgogne, UMR CNRS 6302 Univ. Bourgogne Franche-Comté, 21078 Dijon, France
5
Institut ICTEAM, Université catholique de Louvain-la-Neuve, 1348 Louvain-la-Neuve, Belgium
*
Author to whom correspondence should be addressed.
Received: 18 January 2018 / Revised: 12 February 2018 / Accepted: 27 February 2018 / Published: 1 March 2018
(This article belongs to the Section Chemical Sensors)
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Abstract

In this article, we describe a NO2 sensor consisting of a coating based on lutetium bisphthalocyanine (LuPc2) in mesoporous silica. The sensor exploits the absorption spectrum change of this material which strongly and reversibly decreases in contact with NO2. NO2 is measured by following the amplitude change in the reflected spectrum of the coating deposited on the tip of a silica fibre. As diffusion of NO2 in LuPc2 is slow, the response time could be slow. To reduce it, the active molecules are dispersed in a mesoporous silica matrix deposited by a sol-gel process (Evaporation Induced Self Assembly) avoiding the formation of large crystals. Doing so, the response is fairly fast. As the recovery is slow at room temperature, the recovery time is reduced by exposure to UV light at 365 nm. This UV light is directly introduced in the fibre yielding a practical sensor sensitive to NO2 in the ppm range suitable for pollution monitoring. View Full-Text
Keywords: optical fibre sensors; sol-gel; nitrogen dioxide; lutetium bisphthalocyanine optical fibre sensors; sol-gel; nitrogen dioxide; lutetium bisphthalocyanine
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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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Debliquy, M.; Lahem, D.; Bueno-Martinez, A.; Caucheteur, C.; Bouvet, M.; Recloux, I.; Raskin, J.-P.; Olivier, M.-G. Optical Fibre NO2 Sensor Based on Lutetium Bisphthalocyanine in a Mesoporous Silica Matrix. Sensors 2018, 18, 740.

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