Preparation And Characterization Of Copper Sulfide And Silver Sulfide Micro/nanostructures

This thesis consists of the following three facets:1.Hydrothermal Synthesis of Copper-Sulfide Hollow Nanospheres and Nanotubes and Characterization of StructureCopper-sulfide hollow nanospheres and nanotubes were synthesized at 180℃via a hydrothermal route,using copper sulfate and sodium thiosulfate as the raw materials in the absence of any surfactants or templates.The products are characterized by means of scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and fluorescence spectrometry(FS).The catalytic performance of the products was also evaluated. Moreover,the effects of the ratio of starting materials and volume of solvent on the morphology and microstructure of the CuS nanotubes were investigated.And the formation mechanism of the products was discussed.Results show that the size and morphology of the hollow micro/nanospheres and nanotubes of CuS are highly dependent on the concentration and molar ratio of the reactants.At the same time,the products had good catalytic activity.2.Synthesis of CuS Nanorods by Hydrothermal Method and CharacterizationCopper-sulfide nanorods were synthesized at 180℃by hydrothermal method using CuSO₄ ? 5H₂O and P₂S₅ as the reactants.The products were characterized by means of TEM and XRD.The effect of reaction conditions on the morphologies of the products was investigated.Results indicate that reaction temperature had little effect on the morphology of the product.The variation of the morphology of the product was mainly attributed to the use or not of surfactant and the variation of molar ratio of the reactants. 3.Preparation and Characterization of Silver Sulfide NanoparticlesDi-octadecyl dithiophosphate(DDP),ammonia,and silver nitrate were used as the raw materials to prepare silver/ammonium DDP precursor.The resulting precursor was pyrolyzed in an autoclave in the absence of any solvents,allowing the generation of spherical and tetragonal Ag₂S nanoparticles.The effect of reaction condition on the morphology of the products was investigated,while the microstructure and performance of the products were characterized by means of XRD,TEM,and FS.Results show that the morphologies of the Ag₂S nanoparticles can be controlled by properly adjusting the pressure and heating rate.And Ag₂S nanoparticles have good fluorescence property.