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- W2364366150 abstract "The understanding of the surface crystallography of nano crystallites is necessary for further applications as the properties of nano crystallites are not only dependent upon the large portion of the surface atoms but also determined by the surface crystallographic structure.ZnO nano crystallites with unique properties have been accepted as the prospect building blocks of 3D ordered artificial structures for various advanced applications.PVP-capped ZnO nano crystallites were prepared via the colloid chemistry method.Most importantly with addition size-selective purification procedure the prepared ZnO nano-crystallites are of crystalline structure and 4～5 nm in diameter.The crystalline structure,surface crystallography and photoluminescence property of ZnO nano crystallites have been characterized with X-ray diffraction(XRD),high-resolution transmission electron microscopy (HR-TEM),selected area electron diffraction(SAED),UV-vis optical absorption spectroscopy and photoluminescence(PL).It is found that ZnO nano crystallites were highly crystallized in zincite structure and mono dispersed.The mean size of ZnO nano-crystallites is about 4.5 nm in diameter according to the results of XRD with the Debye-Scherrer theory,ABS and HR-TEM.The shapes and surface crystallography of the ZnO nano crystallites are studied in detail by analyzing the HR-TEM images and corresponding Fourier transformation(FFT) taken from the ZnO nano crystallites,which distributed randomly on the TEM grid.It is found that the sketch of ZnO nano crystallites was a truncated-hexagon pillar and surrounded with the planes of {0001},{0 1 1 0},and {0 1 1 1}.The PL spectra of ZnO nano-crystallites reveal that there are two typical PL emission bands at 362 nm and 527 nm,respectively,attributed to the near-band-edge emission and that of surface defects,as well.In addition,two weak emission bands can be found at 400 nm and 470 nm due perhaps to the polyhedral shape and/or the presence of PVP as well." @default.
- W2364366150 created "2016-06-24" @default.
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- W2364366150 date "2008-01-01" @default.
- W2364366150 modified "2023-09-25" @default.
- W2364366150 title "Preparation and surface indices of polymer-capped crystalline ZnO nano-crystallites" @default.
- W2364366150 hasPublicationYear "2008" @default.
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