Preparation Of Zinc Oxide Nanomaterials And Their Gas Properties

Semiconductor oxide nanomaterials attracted much attention from scientists due to their unique properties and potential applications,especially the research of ZnO nanomaterials as gas sensing materials which was one of the hot field of materials science. As sensor materials, ZnO nanomaterials was performed to depict the superior sensing properties. Moreover hierarchically ZnO nanomaterials or noble metal doped ZnO nanomaterials as gas sensor materials can obtain a higher gas response and a fast response speed. In this paper, our efforts were focused on the study of ZnO nanomaterials, we synthesized hierarchically 3D porous ZnO nanomaterials, porous flower-like ZnO nanomaterials and Au doped ZnO nanowires, their properties and applicantions were also studied. The main contents of this paper are summarized as follows:1,The precursors of interlaced and monodisperse basic zinc nitrate (BZN) nanosheet were successfully prepared by a simple hydrothermal route, using zincnitratehydrate(Zn(NO3)2·6H2O) and ammonia(NH3·H2O, 25wt%)solution as the starting materials, then calcination of the precursors produced hierarchically 3D porous ZnO nanomaterials composed of interlaced ZnO nanosheets. Using hierarchically 3D porous ZnO nanomaterials assembled a kind of gas sensor, investigatived its gas sensing properties to some organic volatile gases, such as ethanol and acetone. We discussed the gas sensing properties of hierarchically 3D porous ZnO nanomaterials to some reducing gases.2,The precursors of flower-like basic zinc carbonate (BZC) were successfully prepared by a simple hydrothermal route, using zincacetatehydrate (Zn(OOCCH3)2·2H2O, 0.01 mol) and CO-(NH2)2(0.02 mol),ethylene glycol (EG),hydrochloric acid (HCl, 1M) solution as the starting materials, then calcination of the precursors produced flower-like ZnO nanomaterials composed of interconnected porous ZnO nanosheets. Using flower-like ZnO nanomaterials assembled a kind of gas sensor, discussing its gas sensor response to some organic volatile gases. Moreover investigatived the gas sensing properties of flower-like ZnO nanomaterials toward some common reducing gases.3,The gold modified zinc oxide nanowires were successfully prepared by a simple hydrothermal route, using zincnitratehydrate (Zn(NO3)2·6H2O), sodium hydroxide, sodium citrate and gold chloride (Aucl3, 2wt%)solution as the starting materials. Using as-prepared zinc oxide nanowires and the gold modified zinc oxide nanowires assembled gas sensors, Compared the sense response of them to some common organic volatile gases. Furthermore, we explored their gas sensing response to 100 ppm ethanol at the different working temperature and their gas sensing properties to some common organic volatile gases at the optimum working temperature.