MQ-137 NH3 NOx Ammonia Gas Sensor Detector Module Range 5-500ppm For Arduino | eBay
Japan NEMOTO electrochemical NH3 sensor ammonia gas sensor NE NH3 / NE NH3 1000 / NE NH3 5000|Sensors| - AliExpress
A 0.05 V driven ammonia gas sensor based on an organic diode with a top porous layered electrode and an air-stable sensing film - Journal of Materials Chemistry C (RSC Publishing)