Fabrication Of Low Dimensional Nanostructures And Properties Study

At present, nano materials have got extensively and intensively interest as they have different properties with macro materials. These materials make the size of devices going to nanoscale gradually. Some novel devices appear based on nano materials. Therefore, controllable and low-cost manufacture of low dimensional nano materials also has important significance in nowadays. This article has done some work in low dimensional nano structure synthesis and properties study as following:(1) As a typical photoelectrical semiconductor, CdS nanoparticals have attractive application at optical absorption, photoluminescence, photoelectric conversion, nonlinear optics, photocatalysis, biological labels and sensors. Through hydrothermal method, solvothermal method and ultrasound-assisted microwave which we specific own, we had tried to doping CdS nano structure with Sr, Cu, Co, Ag. Ultrasound-assisted microwave method had been found to be an effective method to dop Ag into CdS, and this Ag doping can achieve a crystal structure evlution from cubic to hexagonal of CdS nanoparticle.(2) Optical properties of Ag doped CdS nanoparticles had been studied. The characteristic Raman peaks of the CdS nanoparticles enhance with increasing Ag doping ratios. All the samples show a strong photoluminescence at 395nm when the excitation wavelength is 252nm. When the excitation wavelength is 469nm, band gap luminescence, surface state, defect state or impurity state luminescence will all appear. Simple photochemical equipment had been designed and be used to evaluate the photocatalytic activity of different samples. And the photocatalytic activity of different Ag-doped samples show a reasonable change due to different ratios of Ag which doped into CdS.(3) Large length-diameter ratio Ag nanowires had been prepared through a simple liquid phase method. And Dispersions of graphene oxide were produced using a modified Hummers' method; AFM results show that these graphene oxides are single layer and multilayer coexistence.