Enhanced gas sensing property of polyaniline-based ammonia sensor via aerosol-jet printing

Conductive polymer-based ammonia gas sensors show advantage in room-temperature response. Polyaniline (PANI)-based ammonia gas sensors were prepared by drop-coating and aerosol-jet printing methods and tested for their ammonia gas sensing properties. The aerosol-jet-printed sensor shows significantly shortened response and recovery time for ammonia sensing. Morphological observations were carried out to investigate the mechanism of the improvement. The crystalline form of PANI was found to transfer in the aerosol-jet printing process and play the critical rule in the ultra-fast response and recovery of the sensor.