Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 136, Issue 2, Pages 479-483Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.11.028
Keywords
NH3; NASICON; Cr2O3; Gas sensor
Funding
- Natural Science Foundation of China [60574096]
- National Science Fund for Distinguished Young Scholars of China [60625301]
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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. (C) 2008 Elsevier B.V. All rights reserved.
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