Ammonia sensor based on NASICON and Cr2O3 electrode
| Autor: | Hesong Guan, Geyu Lu, Tiegang Zhong, Xishuang Liang, Baofu Quan, Fengmin Liu |
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| Rok vydání: | 2009 |
| Předmět: |
Chemistry
Inorganic chemistry Metals and Alloys Analytical chemistry Ionic bonding Response time Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ammonia chemistry.chemical_compound Electrode Materials Chemistry Fast ion conductor Electrical and Electronic Engineering Porosity Selectivity Instrumentation Water vapor |
| Zdroj: | Sensors and Actuators B: Chemical. 136:479-483 |
| ISSN: | 0925-4005 |
| Popis: | A compact tubular sensor based on NASICON (sodium super ionic conductor) and porous Cr2O3 sensing electrode was designed for the detection of ammonia. The sensor gave excellent sensing properties to 50–500 ppm ammonia in air at 250–450 °C. The EMF value of the sensor was almost proportional to the logarithm of ammonia concentration, the sensitivity (slope) was −89 mV/decade at 350 °C. It was also seen that the sensor showed a good selectivity to ammonia, and an excellent resistance to water vapor. The sensor had speedy response kinetics to ammonia, the 90% response time to 50 ppm ammonia was 30 s, and the recovery time was 60 s. |
| Databáze: | OpenAIRE |
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