Local Structure of ZnO Micro Flowers and Nanoparticles Obtained by Micro-Segmented Flow Synthesis

Authors

  • Shuning Li,

    Corresponding author
    1. Department of Physical Chemistry and Micro Reaction Technology, Ilmenau University of Technology, Weimarer Strasse 32D-98693 Ilmenau (Germany)
    • Department of Physical Chemistry and Micro Reaction Technology, Ilmenau University of Technology, Weimarer Strasse 32D-98693 Ilmenau (Germany)
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  • Dr. Amitava Roy,

    1. Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, Louisiana 70806 (USA)
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  • Dr. Henning Lichtenberg,

    1. Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, Louisiana 70806 (USA)
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  • Gregory Merchan,

    1. Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, Louisiana 70806 (USA)
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  • Dr. Challa S. S. R. Kumar,

    1. Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, Louisiana 70806 (USA)
    2. Center for Atomic Level Catalyst Design, Louisiana State University, Baton Rouge, LA 70803 (USA)
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  • Prof. Dr. J. Michael Köhler

    1. Department of Physical Chemistry and Micro Reaction Technology, Ilmenau University of Technology, Weimarer Strasse 32D-98693 Ilmenau (Germany)
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Abstract

The micro-segmented flow technique was applied for continuous synthesis of ZnO micro- and nanoparticles with short residence times of 9.4 s and 21.4 s, respectively. The obtained particles were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Small angle X-ray scattering (SAXS) and photoluminescence spectroscopy were used to determine the size and optical properties of ZnO nanoparticles. In addition, extended X-ray absorption fine structure (EXAFS) spectroscopy was employed to investigate local structural properties. The EXAFS measurements reveal a larger degree of structural disorder in the nanoparticles than the microparticles. These structural changes should be taken into consideration while evaluating the size-dependent visible emission of ZnO nanoparticles.

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