Ultrasonically synthesized nanocrystalline ZnO powder-based thick film sensor for ammonia sensing

Purpose - The purpose of this paper is to show how to obtain better response, selectivity and fast response and recovery from nanocrystalline ZnO-based gas sensors as compared to conventional materials.Design methodology approach - Nanocrystalline ZnO powders were prepared from the ultrasonic spray...

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Bibliographic Details
Published in:Sensor review 2010-01, Vol.30 (4), p.290-296
Main Authors: Patil, L.A, Bari, A.R, Shinde, Deo, Vinita
Format: Article
Language:English
Subjects:
Aerosols
Ammonia
Analysis
Chemical compounds
Chemical elements
Crystallites
Gases
Grain size
Inorganic chemistry
Laboratories
Morphology
Nanocrystals
Nanotechnology
Optical properties
Organic chemicals
Recovery
Scanning electron microscopy
Screen printing
Selectivity
Sensors
Spectrum analysis
Studies
Thick films
Topography
Trapping
Ultrasonic transducers
X-rays
Zinc oxide
Zinc oxides
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Summary:Purpose - The purpose of this paper is to show how to obtain better response, selectivity and fast response and recovery from nanocrystalline ZnO-based gas sensors as compared to conventional materials.Design methodology approach - Nanocrystalline ZnO powders were prepared from the ultrasonic spray pyrolysis method. Aqueous solution of zinc acetate was atomized using ultrasonic atomizer. The aerosol generated was fed to the reaction furnace for pyrolysis. Nanocrystalline ZnO crystallites were collected using simple but novel trapping system. Thick film resistors of this powder were fabricated using screen printing technique.Findings - As-prepared powder was studied using X-ray diffraction, transmission electron microscopy and scanning electron microscopy to know structure, size of nanocrystallites and microtopography, respectively. Absorption spectroscopy is used to determine the band gap energy. The gas-sensing performance of this film was tested.Originality value - The sensor was found to be the most sensitive to NH3. It gives better response, selectivity and fast response and recovery as compared to conventional materials-based thick films.
ISSN:0260-2288
1758-6828
DOI:10.1108/02602281011072161