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Opt Lett. 2010 May 1;35(9):1476-8. doi: 10.1364/OL.35.001476.

Diffractive optic sensor for remote-point detection of ammonia.

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  • 1Department of Materials Science, University of Patras, Patras 26 504, Greece.


Remote-point photonic sensors are fabricated and evaluated. They are based on nanocomposite thin films comprising NiCl(2) nanocrystals embedded in sol-gel silica matrix and are patterned using direct UV laser microetching techniques to form surface relief structures, which exhibit environment sensitive optical diffraction effects. A strong response to ammonia is detected via the alteration of diffraction efficiency of its orders upon exposure to the analyte. Detection of ammonia in the 2 ppm level with a typical response time of about 30 s in the ambient, 50% RH 20 degrees C, room environment is demonstrated.

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