Semiconductor ZnSnO₃Gas Sensitive Material Preparation And Its Performance Study

The ternary semiconducting metal oxide ZnSnO3is fine as gas sensitive material,the research of ZnSnO3nanometer materials synthesis and preparation is thefoundation of scientific research and application. This very important significance tofuture understands the growth mechanism and nucleation process. In the field ofsensor, its gas sensitive properties were studied and improved. To explore theconnection between the compositions, morphology, structure and the sensitivecharacteristic also has important theoretical significance and practical value. Up tonow, various shape and size of the ZnSnO3material were reported, includingoctahedron,14-faced polyhedral, cube, hollow spheres, nano-cages, nano-skeletons,hierarchical structures. How to apply low cost method of the preparation of thestructure and size uniformity of zinc stannate become a research hot topic, also is ahot research topic of a sensitive material improving gas-sensing properties. It is veryimportant to research the gas sensing properties of ZnSnO3nanostructures andexplore the relationship between the morphology, component, and gas sensingproperties, which is also a hot spot to improve gas sensitive material properties. Thisthesis is to study the semiconducting metal oxide ZnSnO3, under differenttemperatures using the wet chemical method prepared many morphology ZnSnO3, thesubsequent hydrothermal preparation of Ag doping layer flake ZnSnO3structure,studied the not doping and doping layer of Ag flake ZnSnO3sensitive properties ofnano materials, and also the ZnSnO3nano materials preparation, characterization andforming mechanism of gas sensitive properties, etc, has carried on the thoroughdiscussion. This paper explores the many good conclusions are obtained.The research results show that using cetyl trimethyl ammonium bromide (CTAB)auxiliary hydrothermal synthesis method of the preparation including simple cubicstructure, plantlike and14-faced polyhedra of morphology, the structure of the sidelength on the range of a few nanometers to hundreds of nanometers. Using heater gassensor for the preparation of special morphology of zinc stannate product winesusceptibility test, all exhibits good gas sensitive performance characteristics.. At theoptimal operating temperature of260℃, the cube responses of the sensor are about1.3,1.39,1.5,1.3and2.2to10,20,30,40and50ppm ethanol; The plantlikeresponses of the sensor are about1.85、2.23、3.2、3.6and4.68to10,20,30,40and50 ppm ethanol; The14-faced polyhedral in10,20,30,40and50ppm ethanol sensitivityare1.75、2.2、3.14、3.51and4.47.Ag-doped plantlike ZnSnO3have been synthesized by a hydrothermal method.Compared with not doping Ag flake ZnSnO3structure, obvious changes, the surfacehas a lot of silver nano-particles deposited. Ag-doped plantlike ZnSnO3showed goodselectivity and sensitivity to ethanol. Ag doped plantlike ZnSnO3samples for ethanolgas has good response and repeatability. The responses of the sensor are about5.18、7.77、14.03、19.74and26.07to10,20,30,40and50ppm ethanol, response andrecovery time is about25and5s, respectively.