Ammonia gas sensors ink-jet printed on textile substrates

This work describes the fabrication of ammonia gas sensors on textile substrates by using the reactive inkjet printing for the deposition the polyaniline gas sensing layers. These layers were printed over vacuum deposited gold electrodes designed for the purposes of sensor conductivity analysis. The sensing properties such as sensing linearity, response and recovery times were studied in the range of ammonia gas concentrations from 15 to 100 ppm. The fabricated sensors showed a relevant increase in relative resistance from 0.30 to 14.4 times after exposing to ammonia gas at the concentrations of 15–100 ppm for 120 sec.