Preparation Of ZnO 1-Dimensional Nano-Structure And Research Of Its PH Sensing Properties

ZnO is aⅡ-Ⅵsemiconductor compound materials with a wide direct band gap. And the crystalline structure is hexagonal wurtzite structure, exist natively zinc interstitial atom and oxygen vacancies defects. ZnO is a new multi-functional semiconductor material, with piezoelectricity, electrical conductivity, sensing properties, gas sensitivity and a lot of other superior performances, it has wide application prospects in lasers, sensors, solar battery and other fields. ZnO is an amphoteric oxide, it can cause electromotive force and currents changes in solution. Making use of ZnO which has unique chemical properties can be as the test solution pH value of the standard. At present the pH chemical sensors are still studying the development stage, ZnO one-dimensional nano-materials are heading for the practical application of research development. Therefore, it has an important significance for the research of ZnO pH sensing properties.In this thesis,ZnO one-dimensional nano-materials and Co-doped ZnO one-dimensional nano-materials were prepared on ITO conductive glass substrate with three-electrode electrochemical deposition system. SEM, XRD, PL, EDS and XPS were applied to characterize the surface topography, crystal structure, luminescence properties and components of the samples. The results show that the prepared ZnO nano-material has a good crystal quality using electrochemical deposition techniques. Co ions have been successfully doped into the ZnO lattice. The pH sensing properties of the ZnO one-dimensional nano-materials and Co-doped ZnO one-dimensional nano-materials were analysed by electrochemical cyclic voltammetry. The relationship between pH value and current and voltage was obtained.