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Proceedings Article

Ammonia detection in water with a tin dioxide based optical sensor

[+] Author Affiliations
Marco Pisco, Marco Consales, Stefania Campopiano, Antonello Cutolo, Andrea Cusano

Univ. of Sannio (Italy)

Roman Viter, Valentin Smyntyna

Odessa National Univ. (Ukraine)

Michele Giordano

Institute of Composite Biomedical Materials, NRC (Italy)

Proc. SPIE 5952, Optical Fibers: Applications, 595214 (October 05, 2005); doi:10.1117/12.622297
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From Conference Volume 5952

  • Optical Fibers: Applications
  • Leszek R. Jaroszewicz; Brian Culshaw; Anna G. Mignani
  • Warsaw, Poland | August 28, 2005

abstract

In this work, the possibility to detect ppm ammonia concentrations in water environment, at room temperature, by means of Standard Optical Fibers (SOFs) sensors coated by Metal Oxides (MOXs) films has been demonstrated. Electro-spray pyrolisis technique has been used to deposit SnO2 films onto the distal end of single-mode optical fibers. This deposition technique allows the possibility to tailor the fabricated films properties by varying the deposition parameters, such as the metal chloride concentrations, the solution volume and the substrate temperature. The sensor operating principle relies on the measurement of the light intensity reflected by the fiber-sensitive layer interface: the pollutant molecules adsorption within the MOX film causes a change in its complex dielectric function and thus in the fiber-film reflectance. Spectral characterization of the obtained sensing probes has been carried out in the range 400-1750nm. Single wavelength reflectance measurements have been carried out to test the sensor performances for ppm ammonia detection. High sensitivity to the target analyte, response times of approximately 10-20 minutes and a Limit Of Detection as low as sub-ppm has been observed.

© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Marco Pisco ; Marco Consales ; Stefania Campopiano ; Antonello Cutolo ; Roman Viter, et al.
"Ammonia detection in water with a tin dioxide based optical sensor", Proc. SPIE 5952, Optical Fibers: Applications, 595214 (October 05, 2005); doi:10.1117/12.622297; http://dx.doi.org/10.1117/12.622297


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