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

Sensors
Marc DebliquyMarie-Georges Olivier

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.

References

Aug 9, 2005·Advances in Colloid and Interface Science·J A de Saja, M L Rodríguez-Méndez
Aug 9, 2006·European Heart Journal·Anne MaitreRégis de Gaudemaris
Oct 15, 2008·Optics Express·Christophe CaucheteurPatrice Megret
Jan 6, 2010·Inhalation Toxicology·Jeremy P LangrishAnders Blomberg
Dec 8, 2010·Journal of Nanoscience and Nanotechnology·Laurent SpinelleAlain Pauly
Jan 1, 2017·Environment International·Nuria CastellAlena Bartonova

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Citations

Mar 25, 2019·Mikrochimica Acta·Dnyandeo Pawar, Sangeeta N Kale

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Methods Mentioned

BETA
EISA
quartz crystal microbalance
quartz microbalance

Software Mentioned

PIARC

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