Changle Wu

Huazhong University of Science and Technology, Wuhan, Hubei, China

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Publications (4)0 Total impact

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    ABSTRACT: Flower-like ZnO nano/microstructures have been synthesized by thermal treatment of Zn(NH3)42+ precursor in aqueous solvent, using ammonia as the structure directing agent. A number of techniques, including X-ray diffraction (XRD), field emission scan electron microscopy (FESEM), transmission electron microscopy (TEM), thermal analysis, and photoluminescence (PL) were used to characterize the obtained ZnO structures. The photoluminescence (PL) measurements indicated that the as-synthesized ZnO structures showed UV (∼375 nm), blue (∼465 nm), and yellow (∼585 nm) emission bands when they were excited by a He–Gd laser using 320 nm as the excitation source. Furthermore, it has been interestingly found that the intensity of light emission at ∼585 nm remarkably decreased when the obtained ZnO nanocrystals were annealed at 600 °C for 3 h in air. The reason might be the possible oxygen vacancies and interstitials in the sample decreased at high temperature.
    Materials Research Bulletin. 01/2008;
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    ABSTRACT: Different morphologies of ZnO nanocrystals have been achieved controllably by agent-assisted chemical-liquid-deposition process. In this approach, no additional template materials or substrates are needed to obtain different morphologies in the reaction process. The rod-like ZnO nanocrystal has been synthesized by decomposing Zn(OH)42− directly in the solution. The slice-like and flower-like ZnO nanocrystals of hexagonal phase have also been obtained, respectively, using sodium citrate and ammonia as the structure directing agents. A very strong UV emission at ∼380 nm and green emission at ∼510 nm are observed in the photoluminescence (PL) spectra of the three kinds of ZnO nanocrystals. The possible formation mechanisms for synthesized ZnO nanocrystals with different morphologies have also been phenomenologically proposed.
    Materials Chemistry and Physics. 01/2007;
  • Journal of Luminescence - J LUMINESC. 01/2007;
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    ABSTRACT: Nanocrystalline ZnO particles were prepared by a novel aqueous route from zinc nitrate hexahydrate without any requirement of calcinations step at high temperature. A comparative study of chemical reactions from zinc nitrate hexahydrate to ZnO was made under different temperature. The results reveal that with the increase of the reaction temperature, the morphology of particles seems to change from rod-like to short prism-like form. The photoluminescence band was at near 380 nm and no other bands were observable, which proved to exhibit high optical property and might have potential application in nanoscale optoelectronic devices.
    Materials Letters - MATER LETT. 01/2006; 60(15):1828-1832.