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5 March 2021 Detecting PPM ammonia over wide range using laser induced fluorescence of vapochromic coordination polymers
Glenn H. Chapman, Dawei Yin, Bonnie Gray, Daniel Leznoff
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Proceedings Volume 11693, Photonic Instrumentation Engineering VIII; 116930W (2021) https://doi.org/10.1117/12.2584207
Event: SPIE OPTO, 2021, Online Only
Abstract
The detection of ammonia over a wide range from parts per millions (PPM) to 1000’s ppm in a single sensor is of great importance for industrial applications. We have been exploring Vapochromic Coordination Polymers (VCP) specifically Zn[Au(CN)2]2, that was developed to achieve fluorescence when exposed to NH3. Upon high concentration ammonia exposure, the fluorescent peak under near-UV stimulation undergoes a spectral shift from 470nm to 530nm, while the intensity increases by 3~4X. However, at ammonia concentrations < 100 ppm, there is almost no peak wavelength spectral shift or intensity change and only subtle fluorescent spectrum alterations. Using a 405nm laser diode excitation source provides a narrow (4nm) stimulation easily separated from the emission peak. The emission is focused on a USB portable spectrometer (430 to 650 nm). First we create a method that gives unique values over the range <1000 ppm by dividing the spectrum into 20 nm bins, and integrate the emission in each bin, relative to that of 0 ppm exposure (Sum of Integrated Emissions). The key point in this analysis is to note that the way the spectrum changes in each wavelength bin varies at different ammonia ppm exposures. SIE gives excellent sensitivity between 0-50 ppm and <300 ppm, but the 100-300 ppm region has low accuracy. There we change the metric to the Spectral Region Subtraction (SRS) by separating the spectrum into (A) 430-516 nm and (B) from 516 -650 nm, integrate the spectrum and subtract A from B, giving a rapid change within 100-300 ppm.
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Glenn H. Chapman, Dawei Yin, Bonnie Gray, and Daniel Leznoff "Detecting PPM ammonia over wide range using laser induced fluorescence of vapochromic coordination polymers", Proc. SPIE 11693, Photonic Instrumentation Engineering VIII, 116930W (5 March 2021); https://doi.org/10.1117/12.2584207
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KEYWORDS
Polymers
Laser induced fluorescence
Luminescence
Near ultraviolet
Semiconductor lasers
Sensors
Spectroscopy
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