Preparation And Optical Properties Research Of Ⅱ-Ⅵ Nano Materials With Different Morphologies

With the development of the integration, the role of small size semiconductor nano materials is becoming more and more important. When the material’s size is changed, the quantum effect makes the semiconductor nano materials have different optical and mechanical properties with the bulk materials. The wide band- gap II- VI group semiconductor nano material is also widely used in optoelectronic devices, solar cells, laser. In this paper, we studied the contr ollable synthesis and optical properties of CdSe/Cd Te four corners like nano heterostructures. Studied of Zn Se microspheres for the controlled synthesis and the controllable synthesis and photocatalytic properties of multi shell ZnSe core shell structure microspheres. The specific research contents are as follows:1. CdSe/CdTe heterostructured nano-tetrapods with type II band alignment were synthesized by a simple chemical method in solution.High-resolution transmission electron microscopy(HRTEM) images show that Cd Se/Cd Te heterostructures are composed by CdSe tetrapod with CdTe nanorods epitaxially grown on the four arms. No core–shell heterostructures were observed. UV–visible absorption spectroscopy(UV–vis)shows that the absorption peak of CdSe/Cd Te heterostructure tetrapod nanocrystals is red-shift comparing with that of CdSe tetrapod-shaped nanocrystals. It is also weaker and broader than that of nano-tetrapods. The room-temperature photoluminescence(PL) intensity ofheterostructures is much weaker than that of CdSe nano-tetrapods. It is believed that it is due to the spatial separation of electrons and holes in heterostructures.2. Using chemical bath depos ition method, a ZnSe spher ical particles prepared at a certain temperature. The morphology and the size of the particle was observed by scanning electron microscopy(SEM). Study the structure and composition phase of the particle with X-ray diffraction(XRD), and used UV- visible spectrometer for its optical absorption properties at room temperature. The results showed that, ZnSe crystals formed cubic phase structure. UV- Vis absorption spectrum display of both red and near-infrared light are absorbed by the sample.3. Using the solvent thermal method, in the solvent(EG), multi shell ZnSe core shell structure microspheres were successfully synthesized by using EDTA as assistant agent.The prepared ZnSe microspheres were characterized by transmission electron microscopy(TEM), scanning electron microscopy(SEM), X-ray diffraction(XRD), X-ray energy dispersive spectrometer(EDX) and UV–vis absorption spectroscopy. The PL spectrum exhibited a strong green emission peak of the Zn Se microspheres centered at 567 nm. The results of photocatalysis of methyl red indicate that the cmulti shell Zn Se core shell structure microspheres possess the remarkable visible-light-responsive photocatalytic activity.