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The one dimensional Y_2O_3 : Eu nanomaterial synthesis and luminescence properties of Research

Author: PengLiXia
Tutor: WangMinQuan；HongZhangLian
School: Zhejiang University
Course: Materials Physics and Chemistry
Keywords: One-dimensional nanomaterials Yttria pH value Hydrothermal Template Light
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 198
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Abstract


One-dimensional nanomaterials because of its important theoretical significance and potential broad application prospects become the cutting edge of physics, chemistry, materials research disciplines. Currently, the development of new methods of preparation of the one-dimensional materials, pioneering new system is a very important research topic. Summary of one-dimensional properties of the materials, synthetic methods, application and development of the status quo based on, respectively, using the hydrothermal method and solvothermal synthetic one-dimensional structure of yttrium oxide precursor Y 4 O (OH) 9 (the NO 3 ), and finally, preparation and study of the Y- 2 O 3 : Eu a luminescent properties of nanostructures research program. Paper application testing means of DTA-TG, XRD, SEM, EDS, TEM, FT-IR and fluorescence spectroscopy to characterize the different templates, pH value, reaction temperature, reaction time and other process parameters on the morphology, size, structure and luminescence the impact of the performance. Thesis can be divided into two parts: (1) by hydrothermal method and solvothermal synthesis of one-dimensional structure Y of optimum process conditions 4 O (OH) (NO 3 ) powder, analysis and synthesis mechanism. The results show that under the specific process conditions, pH, and crystal structure is to determine the one-dimensional structure Y 4 O (OH) 9 (the of NO 3 ) the morphology of the main factors; template and solvent have a certain effect on the morphology and development of one-dimensional nanostructures, such as the template and the choice of solvent will morphology, particle size, impact, and even undermine the formation of one-dimensional nanostructures . Studies have found, pH of 7:00 obtained micron size the three prismatic structure; When the pH is greater than or equal to 8:00, the obtained sectional sharp circular nanorod bundle structure; with a further increase of the pH value, the nanorods beam size Less small. In addition found that the reaction temperature is too high or too low is not conducive to the formation of one-dimensional nanostructures. A suitable hydrothermal treatment temperature of 180 ° C; at this temperature, the more stable the structure of the nano-rods beam: no significant changes in the structure of nano-rod bundle with the increasing reaction time, only a slight increase in size. (2) in the aforementioned study based on the first synthesis of one-dimensional structure of the europium doped yttrium oxide precursor, obtained by the heat treatment process of one-dimensional nanostructures Y 2 O 3 : Eu powder. The results showed that the 500 ° C heat treatment to obtain pure phase, good crystalline Y 2 O 3 : Eu nanopowder; and with the heat treatment temperature increases, the final product luminous intensity: with good dispersion properties of Y 2 O 3 : Eu nanopowder still available after the 1000 ° C high temperature heat treatment. Addition, the different Nano precursor prepared in the different pH conditions morphology have a greater impact on the luminescent properties: the higher the luminous intensity of three prism prepared when the pH value of 7 micron, and raise the pH value after the nano rod bundle emitting intensity was significantly reduced.

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