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Alcohol-sensing characteristics of spray deposited ZnO nano-particle thin films
ZnO nano-particle thin films were deposited on cleaned glass substrates by spray pyrolysis technique using the precursor solution of zinc acetate dihydrate [Zn(CH 3COO) 2·2H 2O]. Structural analyses and surface morphology of the resulting films were carried out by X-ray diffraction (XRD) and scannin...
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Published in: | Sensors and actuators. B, Chemical Chemical, 2011-12, Vol.160 (1), p.1043-1049 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | ZnO nano-particle thin films were deposited on cleaned glass substrates by spray pyrolysis technique using the precursor solution of zinc acetate dihydrate [Zn(CH
3COO)
2·2H
2O]. Structural analyses and surface morphology of the resulting films were carried out by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD analyses confirm that the films are polycrystalline zinc oxide, possessing hexagonal wurtzite structure with crystallite size ∼25
nm. The SEM micrograph of the film shows a good uniformity and a dense surface having spherical-shaped grains. Alcohol sensing characteristics of the deposited films have been investigated for various concentrations of methanol, ethanol and propan-2-ol in air at different operating temperatures. At 150
ppm concentration, the film shows maximum response (85.2%) to propan-2-ol at the operating temperature of 250
°C; whereas at the same concentration 150
ppm, the maximum responses to methanol and ethanol at 300
°C are observed to be 75.8% and 52.4%, respectively. Also, the film exhibits selective high response to propan-2-ol, followed by ethanol and methanol, respectively at each operating temperature up to 275
°C. This selectivity is more pronounced in the region of lower operating temperatures and concentrations. A possible reaction mechanism of alcohol sensing has been proposed. |
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ISSN: | 0925-4005 1873-3077 |
DOI: | 10.1016/j.snb.2011.09.023 |