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.
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