Gas sensing properties and mechanism of zinc stannate thick film gas sensors by doping noble metal catalysts
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Abstract:
NanoZnSnO3 powders were prepared by the coprecipitation method, using ZnSO4·7H2O SnCl4·5H2O as the starting material. The ceramic powders were characterized by Xray diffraction and transmission electron microscopy. Pure and noble metaldoped ZnSnO3 thick film gas sensors were fabricated by an indirect heating process and the gas sensing properties were tested. The reason for the above improvement was analyzed on a gas sensing mechanism and the basis of morphology observation of these thick film sensors. The results show that the sensitivities of these thick sensors to combustible gases, such as C2H5OH and H2, are greatly improved. Gas sensitivities of thick sensors with doping metallic irons, including Ag+ and Pd2+ to hydrogen gas, are fifteen times greater than that of pure ZnSnO3 thick film sensors. The grain size is inhibited and more gas holes cover the surface by doping metallic irons, the key reason for the improved gassensing properties.
