Abstract
Detection of ammonia (NH3) concentration plays an important role in monitoring and controlling air pollutants. However, the existing NH3 detection methods do not conform to current needs. A low-cost and easily-realized gas sensing system for NH3 detection is developed using two near-infrared (NIR) liquid quantum dot light emitting diodes (QD-LEDs), a single photoelectric detector and time-division multiplexing (TDM) technique. The liquid-type NIR QD-LEDs are fabricated by a combination of PbSe QD solution with blue GaN LEDs. A long path gas cell is designed and adopted for realizing and enhancing gas detection. Detailed measurements are carried out to study the performance of the sensor system. The results show that the detection limit of the system is 10ppm, and the corresponding measurement relative error of 4 h continuous monitoring is less than 2%. The proposed sensor has potential applications in various fields requiring NH3 detection such as in atmospheric quality assessment, industrial products processing, medical diagnosis, and so on.
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