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Study on Formaldehyde Gas Sensing Properties of ZnSnO3 Nanoparticles

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Nanocrystalline ZnSnO3 gas sensing material is prepared by sintering a precursor ZnSn(OH)6 at 600 °C for 2 h which is synthesized by a room temperature solid state reaction process. Then the as-prepared sample is doped with Au element by using an impregnation method. The un-doped nanopowders are characterized by X-ray diffraction and transmission electron microscopy. The results showthat the un-doped sample is pure ZnSnO3 with a perovskite structure, and their average particle size is around 30–70 nm. Formaldehyde sensing properties of ZnSnO3 based sensors are also measured by mixing a gas in air at static state. Experimental results indicate that Au element can remarkably improve the formaldehyde-sensing properties of ZnSnO3-based sensors, especially when the doping proportion of Au is at 0.5 wt%. It is promising to use for detecting indoor environment and air pollution.
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Document Type: Research Article

Publication date: December 1, 2008

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