5 November 2013 Colorimetric polymer-metal nanocomposite sensor of ammonia for the agricultural industry of confined animal feeding operations
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Abstract
The proposed colorimetric sensor of ammonia for the confined animal feeding industry uses the method of optoelectronic spectroscopic measurement of the reversible change of the color of a nanocomposite reagent film in response to ammonia. The film is made of a gold nanocolloid in a polymer matrix with an ammonia-sensitive indicator dye additive. The response of the indicator dye (increase of the optical absorption between 550 and 650 nm) is enhanced by the nanoparticles (∼8  nm in size) in two ways: (a) concentration of the optical field near the nanoparticle due to the plasmon resonance and (b) catalytic acceleration of the chemical reaction of deprotonization of the indicator dye in the presence of ammonia and water vapor. This enhancement helps to miniaturize the sensing element without compromising its sensitivity of <1 parts per million (ppm) for the range 0 to 100 ppm. The sensor underwent field tests in commercial poultry farms in Georgia and Arkansas and was compared against a scientific-grade photoacoustic gas analyzer. The coefficient of correlation between the sensor and the photoacoustic data for several weeks of continuous side-by-side operation in a commercial poultry house was ∼0.9 and the linear regression slope was 1.0. The conclusions on the necessary improvements were made.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Sergey S. Sarkisov, Michael Czarick, Brian D. Fairchild, Yi Liang, Tatiana V. Kukhtareva, Michael J. Curley, "Colorimetric polymer-metal nanocomposite sensor of ammonia for the agricultural industry of confined animal feeding operations," Optical Engineering 53(2), 021107 (5 November 2013). https://doi.org/10.1117/1.OE.53.2.021107 . Submission:
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