Preparation And Performance Studies On One-dimensional Cadmium Hydroxide Nanomaterials

Cadmium hydroxideis a wide bandgap semiconductor and based on its specific opticaland electrical properties, has important applications in photo transistors and diodes, solarcells, biological fluorescent probe and cathode electrode materials of batteries etc. Atpresent. Researchers have developed a variety of methods to synthesis Cd（OH）₂nanomaterial. However, it is still a major challenge to develop a facile one-step route for thepreparation of nanomaterials. This paper presents a simple room-temperature solutionmethod for synthesis cadmium hydroxide nanomaterials. Different morphologies ofcadmium hydroxide can be prepared through controlling the reaction conditions. A in-depthinvestigation has been carried out to understand the factors influencing the morphology ofthe products. At the same time their formation mechanisms are also discussed. Then weresearch the battery performance and sensitive properties of different morphologiescadmium hydroxide nanomaterials. The main research contents of this thesis as follows:1．A new dipolar binary liquid strategy has been developed to Cd（OH）Cl hollownano-spiremes’ synthesis, in which different Cd（OH）Cl nanostructures including1Dnanostructures （nanorods, nanobelts, nanowires and nanorod arrays）,2D nanostructures（nanoplates）,3D nanostructures （nanocubes and hollow microspheres） have also been easilyobtained without using any templates or catalysts. A serial of comparison experimentsdemonstrate that OH-ion and CdCl2solution concentrations play significant roles for thenanostructures’ formation in this dipolar binary liquid system. Through a simpleanion-exchanging process at room temperature, the as-prepared Cd（OH）Cl hollownano-spiremes have been converted into the corresponding Cd（OH）₂one-dimensionalnanostructures, in which the primary Cd（OH）Cl nano frameworks can be preserved. Inaddition, the electrochemical property and gas sensing properties’research of as-preparedproduct demonstrated Cd（OH）Cl and Cd（OH）₂1D nano-spiremes have good sensitivity toethanol gas. Cd（OH）₂one-dimensional nano-spiremes is a kind of high capacity, highstability Ni-Cd battery negative materials due to their interesting ordered hollownanostructures.2．By choosing appropriate reactants （Cd（NO3）₂）, a new dipolar binary liquid strategyhas been developed to synthesis of Cd（OH）₂one-dimensional nanoarray. A serials of comparison experiments researched that OH-ion concentrations influence the nanoscaledand morphologies of the products. Meanwhile explores the optimal reaction conditions tosynthesis one dimensional nanoarray. The electrochemical properties’ research ofas-prepared product demonstrated Cd（OH）₂one-dimensional nanoarray is a kind of highcapacity and high stability Ni-Cd battery negative materials. As-prepared Cd（OH）₂one-dimensional nanoarray as Ni-Cd battery negative materials can basically eliminatebattery long-standing’ memory effects.