Hydrothermal Synthesis And Characterization Of Nano-silver,Mixed Oxides And Halides

Hydrothermal synthesis means that the high-temperature, high pressure under some hydroxide in water solubility than the corresponding oxide in the water solubility, so hydroxide precipitates oxides into water at the same time. Hydrothermal Synthesis method has the advantage of being directly generated oxides, to avoid a general liquid phase synthetic methods require oxide calcined into this step, thereby greatly reducing the hardware group and avoid sudden formation. In addition, hydrothermal synthesis of nano-particles also generate a small particle size, narrow particle size distribution, and the advantages of pure ingredients. By use of hydrothermal synthesis of a dimensional nanostructures Agand mixed oxides, halides, andα-Fe2O3 coated on Ag to form the core-shell structure of nanoparticles which own magnetic. It will further expand the scope of the application materials.By assisted of surfactant, we use a simple hydrothermal process to synthesize one dimensional nanostructures Ag structure, respectively: nanorods, nanospheres and nanospheres cluster. The single crystal nature of rod-like Ag was showed by the patterns of XRD and SAED. We observed that the obtained nanorod was of small diameter, and high aspect-ratio (10~20 nm in width and 500 nm~2μm in length) by TEM. It has been found that the reaction time of the micelle solution, reaction temperature and the amount of PVP all play important roles in the formation of Ag nanocrystals with various morphologies. Moreover, the mechanism for the morphology control of Ag have also been preliminarily presented.Ag-Fe2O3 composite nano-pseudo-spheres with a core-shell structure were prepared by the hydrothermal process in the presence of PVP. X-ray diffraction (XRD), transmission electron microscope (TEM), selected area electron diffraction (SAED) and magnetic properties measurement system were employed to characterize the morphology, structure , magnetic properties of the nano-pseudo-spheres materials. The result of magnetic properties measurement system has a ferromagnetic behavior. Moreover, a rational mechanism is proposed and we also found that the reaction time, reaction temperature play important roles in the formation of core-shell structured Ag-Fe2O3 nano-pseudo-spheres nanocrystals.The halides of nano-silver particles were synthesized by a simple hydrothermal process. The phase contents and lattice parameters were investigated by X-ray diffraction (XRD). Transmission electron microscope (TEM) and UV-vis were carried out to examine the morphology and average particle size of these powders. The mean particle size was in the nanosale range. The composition and phase structure of obtained samples were showed by XRD. This procedure can be very useful for large scale production of halides.