Solid Electrolyte Type NH₃ Gas Sensor Applicable in a Humid Atmosphere

Abstract

A novel solid electrolyte type ammonia (NH₃) gas sensor was fabricated by the combination of the trivalent aluminum cation conducting solid electrolyte (Al_0.2Zr_0.8)_20/19Nb(PO₄)₃ with La₂O₂SO₄–(NH₄)₂HPO₄ as an auxiliary sensing electrode. Since the present sensor exhibited such a superior sensing performance of theoretical response, which obeys the Nernst relationship between the sensor EMF output and the logarithm of the NH₃ gas concentration along with the stable, continuous, and reproducible response even under humidified condition, it is greatly expected to be applied to a practical NH₃ gas sensing device.