An Electrochemical Ammonia Sensor on Paper Substrate

Abstract

In this article, a room temperature ammonia sensor on a paper substrate is reported. The electrochemical sensor is constructed using platinum electrodes and ionic liquid electrolyte. The amperometric staircase response shows discernible signal differentiation between each concentration of NH3 (5–25 ppm). The rise time and fall time for the NH3 sensor were found to be 8 s and 7 s respectively. The authors believe such a fast respondingNH3 sensor on a paper substrate has never been reported. The detection limit was deduced to be 1 ppm based on the sensitivity versus concentration plot. A 17% decrease in sensor response was observed over 30 days of testing. Implementing an antenna on the paper substrate co-located with the sensor for wireless operation is envisioned in