The Building Of Three-dimensional ZnO, SnO₂ Nanoflower And Gas Performance Research

Rapid technological development of nanotechnology and nanomaterials has profoundly improved the lives of people. Therefore, to use the conventional method for the synthesis of nanomaterials, the exploration and development of simple, efficient, cheap and environmental friendly new route to prepare novel nano-structured materials and the development of new uses and new materials is not just great important in the development of nanoscience, but also in the future nano core research. This article was prepared by hydrothermal synthesis three-dimensional zinc oxide/tin oxide spent metal oxide material, in order to obtain a high performance gas-sensitive material. We use constantly changing experimental conditions systematically synthesized by a three-dimensional flower-shaped, rods, porous flower and butterfly-shaped, etc. With special morphology of nanomaterials, the main contents of this paper were as follows:1. A simple hydrothermal method was used to prepare different morphologies of zinc oxide gas-sensing materials by adding different surfactants. The X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission and scanning electron microscopy(TEM) and other technical means of sample preparation were used to analyze morphology and structure of the product. The results showed that, PVP, CTAB, PEG can be used as synthetic metal oxide zinc oxide surfactant, but the morphology of the sample at the same time in other experimental conditions with different surfactant preparation obtained is very different, without adding surfactant or PVP, CTAB samples were prepared dumbbell-shaped nanomaterials, but when added PEG, the resulting sample is zinc oxide nano-flowers, therefore, can be seen from the above discussion, PEG in an oxidizing zinc nanoflowers formation plays an important role. Gas Sensing test results show, flower-like structures can significantly improve the performance of gas-sensitive materials.2. Adoption of the simple one-step hydrothermal synthesis is assembled from two-dimensional sheet made of three-dimensional multi-level nanoflowers can effectively regulate the three-dimensional morphology multilevel nanostructures by sensible regulation of hydrothermal time. It was found that the porous structure nanoflowers special test gas molecules provide a larger contact surface and a spacious interior, in favor of penetration and diffusion of the gas to accelerate gas sensing response, so that the nano-porous as more flowers potential ethanol sensor material.3. On the basis of porous nanoflowers further by varying the experimental conditions to prepare a butterfly-shaped tin dioxide gas-sensitive materials. The results showed that the butterfly-shaped flowers of tin oxide sensor in optimum operating temperature 300°C for ethanol gas having a high response, short response and recovery time and good selectivity. This is due to the porous morphology provides more active sites and the gas diffusion path, increasing the surface area of the sample.