NASICON固体电解质NH<sub>3</sub>传感器的研制

NASICON固体电解质NH₃传感器的研制

摘要: 本文介绍了一种管式结构的固体电解质NH₃传感器。该传感器是将溶胶-凝胶法制备的NASICON为导电层材料,以掺杂C的Cr₂O₃为辅助电极材料制得的。当工作温度在250～450℃时,器件对浓度为(50-500)×10^-6的NH₃表现出了良好的气敏性能,器件电动势EMF值与NH₃浓度的对数表现出了很好的线性关系,在350℃时,器件的灵敏度为89 mV/decade。同时,器件表现出较快的响应恢复速度,对50×10^-6的NH₃的响应恢复时间分别为30 s和60 s,且有较好的选择性。

Abstract: A compact tubular sensor based on NASICON（sodium super ionic conductor） and carbon-doped Cr₂O₃ sensing electrode was designed for the detection of ammonia.The sensor gave excellent sensing properties to 50-500×10^-6 ammonia in air at 250-450℃.The EMF value of the sensor was almost proportional to the logarithm of ammonia concentration,the sensitivity（slope） was 89 mV/decade at 350℃.The sensor had speedy response kinetics to ammonia,the 90% response time to 50×10^-6 ammonia was 30 s,and the recovery time was 60 s.It was also seen that the sensor showed a good selectivity to ammonia.