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Controlled Synthesis and Photoluminescence of Barium Tungstate/molybdate Micro-or Nanomaterials

Author: YinYongKui
Tutor: ZhouBaiBin
School: Harbin Normal University
Course: Analytical Chemistry
Keywords: Controlled Synthesis Orientation adsorption Luminescence C2H5OH-H2O BaWO4 BaMoO4
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 46
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Abstract


As important optoelectronic functional materials with scheelite structure of molybdenum , barium , tungsten , barium , of molybdate calcium material has been widespread concern , closely linked to their performance and product morphology and size , so the morphology and size of the above materials - controllable synthesis has become a current research focus . This article was first washed with ethanol and water mixture as a solvent at room temperature synthesis fusiform , ellipsoid BaXO 4 ( X = W, Mo ) hierarchical micro- , nanocrystalline ; same time, at room temperature, the use of EDTA do slow-release agent , the first synthesis of a scissors -shaped , multi - foot-shaped , peanut -shaped , the flower shape BaXO 4 < / sub > ( X = Mo; W ) micro- , nano-crystalline ; microemulsion synthesis ellipsoidal spherical and spindle -shaped CaMoO 4 nanoparticles . XRD, SEM, TEM , and other means were used to characterize the structure and morphology of the product . XRD results indicate that : a mixed solvent , the different ratios of ethanol and water to a preferential growth of the different crystal faces great influence ; SEM analysis showed that a mixture of ethanol and water do solvent was synthesized BaXO 4 ( X = W, Mo) micro- nano hierarchical structure materials the morphology mainly by the influence of the solvent composition ratio ; BaXO 4 ( X = Mo ; W ) micro- morphology of the nanocrystals are mainly controlled by EDTA 4 nano the release rate of the barium ion impact; microemulsion W value ( ratio) of the amount of substance of the amount of substance of the water with CTAB , the concentration of the reactants and other factors on the formation of different morphologies of CaMoO particles play a key role ; formation mechanism of the discussion over different methods with different morphologies synthesized product . PL fluorescence spectrophotometer system analysis of the fluorescence of several products , the results showed that : tungsten , molybdenum , barium room temperature fluorescence morphology and size of the product .

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