Solid electrolyte type ammonia (NH3) gas sensors were fabricated using Al3+ ion conducting (Al0.2Zr0.8)20/19Nb(PO4)3 solid electrolyte with an aluminum thin film as a reference electrode. A rare-earth ammonium sulfate double salt of R2(SO4)3·(NH4)2SO4 (R = rare earth) or a lanthanum oxysulfate La2O2SO4-based solid solution was selected as the auxiliary sensing electrode on the basis of thermal stability or water durability. Both sensors with R2(SO4)3·(NH4)2SO4 or La2O2SO4–NH4H2PO4 auxiliary sensing electrodes exhibited a quantitative and theoretical NH3 sensing performance at 230–300 or 170–190 °C, respectively; therefore, sensors based on the (Al0.2Zr0.8)20/19Nb(PO4)3 solid electrolyte are expected to be promising candidates as NH3 detectors that can operate in a wide temperature range of 170–300 °C by changing the auxiliary sensing electrode component.
固态电解质型
氨气传感器采用Al3+离子传导(Al0.2Zr0.8)20/19Nb(PO4)3固态电解质,以铝薄膜作为参比电极。基于热稳定性或耐
水性,稀土
硫酸铵双盐R2(SO4)3·(NH4)2SO4(R =稀土)或氧化
硫酸镧La2O2SO4基固态溶液被选为辅助传感电极。两种传感器分别采用R2(SO4)3·(NH4)2SO4或La2O2SO4-
NH4H2PO4辅助传感电极,在230-300或170-190℃下表现出定量的理论
氨气传感性能;因此,基于(Al0.2Zr0.8)20/19Nb(PO4)3固态电解质的传感器有望成为
氨气检测器的候选者,通过改变辅助传感电极的成分,可在170-300℃的宽温度范围内工作。