Synthesis Of Semiconductor Metal Oxides Nano-materials By Solid-state Chemical Reaction And Its Gas Sensing Properties

Up to now, most commercial applied semiconductor gas sensors were made from ceramics. Since 1990, with the development in Micro-Electronics, Automatization and Computer Science et al, it is believed that the miniaturization, integration and multi-function will be the development trends in gas sensors. The gas sensing efficiency of the material depends on its micro-structural properties which are related to its method of preparation, which plays a very important role with regard to the chemical, structural and properties of nanomaterials. These reported methods for preparing oxide nanomatrials usually require multi-step, higher temperature, special apparatus and rigorous conditions. In this paper, a series of nanomaterials were prepared by simple and convenient low-heating solid-state chemical reaction methods with suitable conditions of experiment. In this paper, the main content is divided into three chapters:In the first chapter, ZnO nanoparticles and nanorods were prepared by one-step solid-state chemical reaction of zinc acetate and sodium hydroxide under the suitable experiment's conditions. The compositions of samples were determined by XRD and TG-DTA. The sphere-like or rod-like morphology of samples were observed by TEM and SEM. The gas sensing properties of ZnO were studied by HW-30A. Results show that the gas sensing properties of ZnO nanoparticles were better than gas sensing properties of ZnO nanorods, ZnO nanoparticles doped with and without Nd2O3 and Ce2O3 were prepared by solid-state synthesis. Crystal structure and microstructure of nanoparticles were characterized by XRD, SEM and TEM. The sensitivity of the materials was investigated at different operating temperatures to ethanol, acetone, LPG, ammonia and hydrogen. The results show that the sensitivity...