NiCl2/SiO2 sol-gel material for ammonia sensing

Anna Tsigara; Nicholas Madamopoulos; Mike Hands; Loukas Athanasekos; Anastasia Meristoudi; George Mousdis; Giannis Manasis; Nikos Vainos; Ioannis Koutselas

doi:10.1117/12.685106

17 October 2006 NiCl₂/SiO₂ sol-gel material for ammonia sensing

Anna Tsigara, Nicholas Madamopoulos, Mike Hands, Loukas Athanasekos, Anastasia Meristoudi, George Mousdis, Giannis Manasis, Nikos Vainos, Ioannis Koutselas

Author Affiliations +

Proceedings Volume 6377, Advanced Environmental, Chemical, and Biological Sensing Technologies IV; 63770B (2006) https://doi.org/10.1117/12.685106
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

Abstract

NiCl₂/SiO₂ sol gel materials are proposed for the first time for ammonia sensing. Thin films are prepared by spin coating or casting the solution on appropriate substrates and tested for sensitivity in ammonia environment. We report a uniform optical response over the visible spectrum in optical transmission. The main mechanism of operation is based on reversible physico-chemical complexation effects, which produce morphology alteration and result in enhanced optical scattering of the thin film material. Such ammonia sensor can find applications in industrial and environmental engineering fields including "on-line" process and quality control, environment monitoring and safety.

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Anna Tsigara, Nicholas Madamopoulos, Mike Hands, Loukas Athanasekos, Anastasia Meristoudi, George Mousdis, Giannis Manasis, Nikos Vainos, and Ioannis Koutselas "NiCl₂/SiO₂ sol-gel material for ammonia sensing", Proc. SPIE 6377, Advanced Environmental, Chemical, and Biological Sensing Technologies IV, 63770B (17 October 2006); https://doi.org/10.1117/12.685106

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