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Self-assembling of ZnO nanoparticles and mesocrystal formation

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Key Laboratory of Inorganic Functional Material and Device, CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences  

中国科学院无机功能材料与器件重点实验室  

  Self-assembling of ZnO nanoparticles and mesocrystal formation  

  Prof. Goran Brankovic  

  Institute for Multidisciplinary Research,   

  University of Belgrade, Serbia  

  时间:2016年05月16日(星期一)上午09:30  

  地点: 4 号楼 14楼第一会议室  

  联系人:郑嘹赢  研究员  

           李国荣 研究员  

  欢迎各位老师同学光临!  

  Self-assembling of ZnO nanoparticles and mesocrystal formation  

  G Branković1, D Luković Golić1, A Rečnik2, N Daneu2, S Bernik2, M Šćepanović3, and Z Branković1 

  1 Institute for Multidisciplinary Research, Kneza Višeslava 1, 11030 Belgrade, Serbia   

  2 Jožef Štefan Institute, Jamova 39, 1000 Ljubljana, Slovenia   

  3 Center for Solid State Physics and New Materials, Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia   

  Zno nanopowder was obtained by the sol-gel method from an ethanol solution of zinc acetate dihydrate. In this synthesis layered zinc hydroxide acetate (ZHA) is an intermediate compound that further transforms into hexagonally shaped ZnO crystallites – nanoplates (d = 4 nm). The obtained ZnO powders were characterized by X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric (TG) and differential thermal analyses (DTA), as well as high-resolution transmision electron microscopy (TEM) and field emission scanning electron microscopy (FESEM). Self organization of primary nanoplates was noted by transmision electron microscopy and confirmed by detailed Rietveld refinement and Raman analysis. Further solvotermal treatment was applied in order to promote self-assembling process. The presence of smaller particles and pores inside the larger hexagonal plates and the single-crystal diffraction pattern confirmed the mesocrystalline nature of the solvothermally prepared ZnO particles. In this study we have shown that it is possible to prepare ZnO mesocrystals without the aid of special organic additives, or face-specific organic molecules, starting from a simple precursor such as an ethanol solution of zinc acetate dihydrate. 

 
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