Abstract
The sensitivity of SnO2–ZnO composites in multilayer with PPy and Al2O3 has been studied. Composites of SnO2–ZnO have been prepared and multilayer sensor has been fabricated using screen printing technique with Al2O3 as substrate on glass plate and PPy in multilayer with SnO2–ZnO. The morphologies of composites of SnO2–ZnO and PPy have been studied by scanning electron microscopy and crystallite size by X-ray diffraction. Sensitivity has been found to be more for 70SnO2:30ZnO/PPy/Al2O3 multilayer sensor, which is supported by scanning electron microscopy and X-ray diffraction studies. It has been found that with the increase in concentration of NH3 gas, the response of multilayer sensor increases.
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