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Gas Sensing Properties of Nanostructured ZnS Thin Films |
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PP: 99-106 |
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Author(s) |
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M. S. Shinde,
Smt. Swapna Samanta,
M. S. Sonawane,
P. B.Ahirrao,
R. S. Patil,
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Abstract |
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| Nanostructured semiconducting Zinc Sulphide (ZnS) thin films were deposited on glass substrate by relatively simple, quick and cost effective modified chemical bath deposition (MCBD) method. The characterization of as deposited thin films was carried out for the structural, compositional, surface morphological and gas sensing properties using X-ray diffraction (XRD), E-DAX, scanning electron microscopy (SEM) and gas sensing static unit. The mechanism of hydrogen sensing by the ZnS thin film is attributed to the reaction on the material surface or removal of chemisorbed oxygen from the film surface by testing gas. The sensor gave optimum responses to different gases at different operating temperatures. The surface misfits operating temperature can affect the microstructure and gas sensing performance of the sensor. The resistance responses of the nanocrystallineZnS thin films were measured by exposing as deposited film to different gases namely ammonia (NH3), carbon dioxide (CO2), ethanol (C2H5OH), hydrogen sulphide (H2S), liquid petroleum gas (LPG), hydrogen (H2) and chlorine (Cl2). It was found that the sensors exhibited various sensing responses to these gases at different operating temperature. The results demonstrated that nanocrystallineZnS thin film can be used as a new type of gas sensing material which has a high sensitivity and good selectivity to Chlorine (Cl2) gas for 500 ppm at room temperature. |
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