Study Of Photocatalytic Activity And Fluorescence Properties Of Nanomaterials Prepared In Aqueous

Nano-materials have numerous remarkable applications such as optoelectronics, biomedicine, and environmental protection, due to their unique properties(quantum size effect, macroscopic tunnel effect, surface effect, etc.), good symmetry(avoiding the interference of the light detection signal) and biocompatibility. Currently, nanomaterials have widely applied to insolar cells, light-emitting diodes, fluorescent bioprobe, genetic testing and so on.With the increasing fields of application, the synthesis and doping of nanomaterials have been studied from different perspectives, such as molecular epitaxy, vapor deposition, sol-gel method, microemulsion method, hydrothermal- solvothermal, etc; and a series of modified methods, for instance, doping or surface modification of a single nanomaterial. Different doping substances and methods have their specific applications, among them, the green, high-quality of synthesis, and efficient doping have been the goal of the majority of experts and scholars. We describes a simple and convenient aqueous phase synthesis method and the doping of rare earth materials in the article, the doped metals improve the shortcomings,optical properties and size of the materials.This paper depicted cuprous oxide and rare earth doped Cd S and Na YF4:Yb nanomaterials in Aqueous:Firstly, Cuprous oxide(Cu2O) nanocrystallites were successfully perepared by using hydrazine hydrate( NH2-NH2·H2O) as reducing agent and polyvinyl pyrrolidone(PVP) as the capping agent and copper sulfate as the copper source, with ammonium hydroxide adjusting p H(p H~8) in aqueous. Using X-ray diffraction(XRD), UV–vis Spectroscopy, scanning electron microscope(SEM), High Resolution Transmission Electron Microscopy(HRTEM) and X-ray photoelectron spectroscopy(XPS) characterized the samples. The diameter is less than 10 nm by XRD and the adhesions phenomenon of the sample is apparent by HRTEM. And using the Methyl Orange as organic dye to study the catalytic performance of Cu2 O.Secondly, Cd S under microwave radiation and doped Na YF4:Yb under high temperature crystallization. We rapid produce rare-earth-doped Cd S, using cadmium chloride as raw materials, the 3-mercaptopropionic acid(MPA) as the stabilizer, and the thiourea as the sulfur source, and sodium hydroxide adjusting the p H. We prepared Cd S: Ho, Cd S: Er, Cd S: Pr nanomaterials to research the influence of different dopant on the material. Analyzing the samples by X-ray diffraction(XRD), high resolution transmission electron microscopy(HRTEM), fluorescence spectroscopy(PL), and liquid UV-Vis absorption spectroscopy. The nanocrystals appears to be cubic sphalerite structure, good lattice and broadened fluorescent area, covering the entire visible region. What’s more, the main material of the upconversion material were yttrium chloride(YCl3·6H2O) solution, ytterbium chloride(Yb Cl3·6H2O), transition metal compound and disodium edetate(EDTA-Na) and sodium fluoride(Na F). Using X- ray diffraction(XRD) and fluorescence spectrometer(PL) to charactered the material, which showed is hexagonal structure. The emission wavelength of Na YF4:Yb/Nd are 549 nm and 660 nm and Na YF4:Yb/Tm is 800 nm under the excitation wavelength of 980 nm, which show that the Na YF4:Yb/Nd and Na YF4:Yb/Tm have their specific emission wavelengths.