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Synthesis and Photoluminescence Properties of Rare Earth Compounds Hollow Structures

Author: XiaoYing
Tutor: JiangKai
School: Henan Normal
Course: Inorganic Chemistry
Keywords: Shell material Rare-earth compounds Template Luminescent materials
CLC: TB34
Type: Master's thesis
Year: 2011
Downloads: 20
Quote: 0
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Abstract


Shell material as a new type of structure function material, has a lot of special properties different from the bulk material, such as large specific surface area, density, the strong permeability surface. Drug delivery, catalyst carrier, electrochemical cells, artificial cells and light-emitting materials field has broad application prospects. Due to the special properties of the shell material and the potential applications, the synthesis and study of such materials has aroused keen interest of scientists. Therefore, many of the prepared shell nanomaterials are gradually development and promotion, in which the template method is one of the most direct and effective way. The rare-earth compounds has unique 4f shell electronic structure and a variety of electronic transfer method, which has the unique optical, electrical and magnetic properties. Synthesis of rare earth materials is the nanomaterials research areas has become an important issue. In recent years, it is synthesized by a variety of methods different morphologies of rare earth compounds, but these methods are mostly prepared to process complexity, high cost, is not conducive to large-scale synthesis of rare earth nanomaterials and commercial applications. The synthetic shell structure through efficient channels rare earth compounds nanostructures is particularly important in the development of rare earth materials. In this thesis, using the template synthesis of various rare earth oxide, fluoride and phosphate shell nanomaterials, photoluminescence properties and synthetic materials to make research. The details are as follows: (1) the Solvothermal Synthesis Y 2 O 3 : Eu 3 empty ball. Ethanol and water as the solvent, and ammonia as the precipitating agent the solvothermal method YOHCO 3 : the of Eu 3 hollow spheres calcined novel structure of the Y 2 O 3 : the of Eu 3 empty ball. By adjusting the reaction temperature, dissolved the proportion of the precipitating agent and the type of reaction parameters of the formation mechanism of the structural material of the empty ball. Without using any surfactant or other hard template, with the bubbles formed in the reaction as a template will be able to build a shell structure. The fluorescence properties of the sample under different conditions were compared, and their fluorescence properties of the doping concentration and morphologies. (2) melamine phenolic resin (MF) microspheres the hard template preparation Y 2 O 3 : the of Eu 3 empty ball. First, low temperature polymerization large-scale synthesis of uniform particle size, size adjustable MF ball. MF ball as a template prepared by precipitation method the Y- 2 O 3 : the of Eu 3 / MF precursors. Removed by calcination internal template and the formation of a well-crystallized Y 2 O 3 : the of Eu 3 empty ball. Were synthesized hatched thick by adjusting the amount of template added 70,100 and 200 nm Y of 2 O 3 : the of Eu 3 empty ball detailed analysis of the impact of the thick shell of its photoluminescence properties. (3) low-temperature chemical conversion method (template) the preparation of EuF 3 HollowNanosphere. First of EuCO 3 spherical precursor synthesized by hydrothermal method, and synthesized EuF 3 HollowNanosphere then through the ion exchange method. Study the formation mechanism of the formation conditions of the product structure and luminescence properties of the empty ball. Expand the experimental results show that this method can be used as a universal route to synthesis of rare earth fluoride shell structure. ⑷ prepared by chemical conversion method (template) GdPO 4 : the of Eu 3 empty ball, the empty ball by the one-dimensional nanowires assembled from hollow structural integrity and having a uniform particle size. Do TEM analysis, proposed a possible formation mechanism of the formation process in different time sampling, and shipped this method to prepare a series of rare earth phosphate.

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