Nitric oxide (NO) sensing is important for many applications including air quality and climate change monitoring. Current sensors have limited sensitivity, selectivity, and are affected by environmental interference such as humidity, which affects their accuracy. We use an ultra-sensitive optical sensing platform known as FLOWER (frequency locked optical whispering evanescent resonator) and combine it with a custom synthesized polymer coating to detect NO at a concentration of 6 ppt, which to the best of our knowledge is the lowest experimentally reported detection of NO to date. In addition, we demonstrate that our sensor is selective and humidity resistant.
We use a system known as FLOWER (frequency locked optical whispering evanescent resonator) to rapidly detect trace amounts of the chemical warfare agent surrogates DIMP and DMMP. We use sorbent polymer layers covalently bound to the surface of the microtoroid cavity to selectively adsorb target gases. As the target gas diffuses into the polymer layer, a measurable change in the resonance frequency of the toroid occurs. We demonstrate 80 ppt (part per trillion) sensing of DIMP; two orders of magnitude better than what can be achieved using mass spectroscopy.
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