5.5.5 Highly Water Durable NH3 Gas Sensor Based on Al3+ Ion Conducting Solid Electrolyte with NH4 +-gallate
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- 5.5 Cation Conductor-based Gas Sensors
- S. Tamura, T. Nagai, N. Imanaka - Division of Applied Chemistry, Graduate School of Engineering, Osaka University (Japan)
- 504 - 506
A water durable ammonia gas sensor was fabricated by combining Al3+ ion conducting solid electrolyte ((Al0.2Zr0.8)20/19Nb(PO4)3) with NH4+-beta-gallate (NH4+-Ga11O17) as the auxiliary sensing electrode and its NH3 gas sensing performance was investigated in humid atmospheres. The sensor exhibited advanced sensing performance with a continuous, quantitative and reproducible response that obeys the theoretical Nernst relationship even in a highly humidified atmosphere containing 4.2 vol.% H2O at 230°C. This superior sensing performance of the proposed sensor in a humid atmosphere should offer to be a practical on-site NH3 gas sensing tool.