Synthesis And Characterization Of Inorganic Functional Materials

As an important component of the inorganic functional materials, magnetic nano-materials and rare earth borate phosphor are applied with a great value. Magnetic nanomaterials in the biomedical field have a broad application prospects, especially the characteristic of movement under the external magnetic field, which in the drug transport and targeted therapy has enormous potential applications. Rare earth borate phosphor which has many character such as high brightness, easy prepared low cost advantages is a new type of rare-earth fluorescent materials in order to adapt to development of the large-screen projection elevision color clarity (HDTV) and computer terminals display technology. Water-soluble and morphology controllable magnetic Fe₃O₄ nano-materials and new rare earth borate phosphor Na₃La(BO₃)₂: Eu³⁺were studied in this article.In this paper, we used ferrous oxalate as iron source to get water- soluble mag- netic Fe₃O₄ nanoparticles through situ decomposition and modified the nanoparticles by SiO2. Through comparing Fe₃O₄ morphology by different surfactant -generated, we found that sodium dodecyl sulfate (SDS) could be more effective dispersed. Gene- rated particles could be steadily existed in aqueous solution for a week. Micro- sphere diameters were observed to be 10-15nm. We also studied the impact of particles prepared in the reaction. Temperature, time and NaAc were the import influencing factors. At last we used St?ber method coat the water- soluble Fe₃O₄ nanoparticles. Subsequently, under the "liquid - solid– solution" phase transfer, phase separation mechanism (LSS mechanism), single-crystal Fe₃O₄ nanorods and nano- particles were synthesized. And reaction process was explained. Summed up the influencing factors of Fe₃O₄ nanorods and nanoparticles, temperature was the main factors of affecting the morphology. The hysteresis curve of the synthesized Fe₃O₄ nanoparticles and nanorods were measured at room temperature. Through the testing, the results showed that the magnetic susceptibilities of the nanorods and nanoparticles had some diffrernces because of the anisotropic. Morphology controllable Fe₃O₄ nanorods and nano- particles had provided the value of reference for the relevant one dimensional morphology of the growth study.At the process preparation Na₃La(BO₃)₂: Eu³⁺ borate phosphor, the impact of the raw materials of the material substances, the reaction temperature were analysised. The optimal initial discharges ratio had been determined. The fluorophor was characterized by X-ray diffraction technique (XRD). Fluorophor's concentration quenching curve was tested. The excitation and emssion spectra of Na₃La (BO₃)₂:Eu³⁺ was measured and explained. The dominated emission of Eu3+ corresponding to the electric dipole transition 5D0-7F2 was located at 613nm in Na₃La0.8Eu0.2(BO₃)₂ It found that Na₃La (BO₃)₂:Eu³⁺ phosphors had wavelength range, high color purity and could be more effective to reduce the concentration quenching effect. Synthesis of the Na₃La (BO₃)₂:Eu³⁺ phosphors enriched the type of rare earth borate phosphors.Finally, NaYF₄: Yb³⁺, Er³⁺ (Y:Yb:Er=80:18:2)was prepared through sol-gel.And the samples were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and fluorescence spectrophotometer.