Study of Characteristics of the Sensor Detecting of Low Concentration of Ammonia

In this work, the morphology of Fe 2 O 3 :ZnO (60 : 40 mol %) film and gas sensing characteristics to ammonia vapors at different operating temperatures were investigated. The SEM investigation of the surface of the sensitive film of Fe 2 O 3 :ZnO showed that the grain size in the film was about 50 ...

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Bibliographic Details
Published in:Journal of contemporary physics 2021-10, Vol.56 (4), p.352-358
Main Authors: Aleksanyan, M. S., Sayunts, A. G., Shahkhatuni, G. H., Aroutiounian, V. M., Shahnazaryan, G. E.
Format: Article
Language:English
Subjects:
Ammonia
Gas sensors
Grain size
Operating temperature
Particle and Nuclear Physics
Physics
Physics and Astronomy
Sensors
Zinc oxide
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Summary:In this work, the morphology of Fe 2 O 3 :ZnO (60 : 40 mol %) film and gas sensing characteristics to ammonia vapors at different operating temperatures were investigated. The SEM investigation of the surface of the sensitive film of Fe 2 O 3 :ZnO showed that the grain size in the film was about 50 nm. The sensor showed sensitivity to ammonia vapors starting at 200°C and the operating temperature was chosen as 250°C. The low detection limit of the sensor based on Fe 2 O 3 :ZnO is quite low (~14 ppm) and at this concentration of ammonia vapors the resistance of the sensor changed more than 1.5 times. The enhanced parameters of the Fe 2 O 3 :ZnO-based sensor will allow using this structure in ammonia detecting devices.
ISSN:1068-3372
1934-9378
DOI:10.3103/S1068337221040034