Controllable Preparation Of Salisalte Intercalated Layered Cobalt Hydroxide Nanomaterial And Properties

In recent years, organic-inorganic nanocomposites have received increasing attention because of their distinctive properties and their wide range of practical and potential applications, such as sensor materials,thermal materials,optoelectronics materials and so on. Organic ion intercalated layered cobalt hydroxide is an important class of organic-inorganic composite materials, it has received enormous attention on the basis of its molecular magnets, gas storage, catalysts and other properties. However, for the controllable synthesis of organic-inorganic composite, especially in the control of the purity, size and morphology, it's still a huge challenge.In this thesis, we present layered cobalt hydroxide intercalated with salicylate (Sal-LCH) that can be formed by a facile precipitation method in aqueous solution. Furthermore, by controlling the experimental conditions, we obtained different sizes of nanosheets and nanorods of Sal-LCH and investigated their properties. Specific contents are as follows: 1. Sal-LCH nanosheets were prepared by a method of one-step precipitation and the controllable preparation of Sal-LCH nanosheets were achieved by variation reaction conditions. The regularity of particle size and morphology as follows:Crystallization time was less than 3 h, Sal-LCH presented in a form of nanoparticles, its size was in 10-20 nm; whereas the time was more than 3 h, Sal-LCH were in a form of nanosheets, the size of nanosheets concentrated 50-100 nm, the thickness was in 10-15 nm. The structure,morphology and thermal stability of these samples were characterized by XRD,FTIR,SEM,TG-DTA,UV-Vis and TEM.2. We obtained the Sal-LCH nanorods which have thermotropic phase transitiony in One-step without template and modifier. The effects such as the temperature, concentration and crystallization time on the crystal and the morphology for the nanorods were studied in detail, realizing the nanorods controllable preparation. The length of nanorods was in 300 nm-10μm and the diameter in 50-125 nm. The thermotropic phase transitiony, thermal stability and recoverability of Sal-LCH nanorods were characterized by various of means. The nanorods had highly thermal stability, will be used as a high stability sensor material.3. The cobalt oxide nanorods and cobalt nanorods which have a high saturation magnetization were obtained by calcining Sal-LCH nanorods precursor in different conditions. The results indicated that cobalt nanorods and cobalt oxide nanorods were with controllable particle size and high distribution. Both can be applied in the catalytic fields as the important materials.