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In gas sensor domain, cross-sensitivity between humidity and ammonia is not well studied in literature. Humidity can induce variation on gas sensor responses and also affect the devices lifespan. The aim of the present work is to clarify the effect of humidity on the response of a resistor used for NH3 monitoring in air quality applications. This survey performs experiments under different relative humidity levels to verify the effect of humidity on the conductivity of the sensing element. Then, the sensor was exposed to different humidity levels and NH3 concentrations to statute on cross-sensitivity of sensors. The device made from a molecular material exhibits a response stable to ammonia in the range of 20-60% of relative humidity.

P1.1.20 Effect of humidity on ammonia sensing by molecular materials