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

  1. Shuning Li1,*,
  2. Dr. Amitava Roy2,
  3. Dr. Henning Lichtenberg2,
  4. Gregory Merchan2,
  5. Dr. Challa S. S. R. Kumar2,3,
  6. Prof. Dr. J. Michael Köhler1

Article first published online: 7 MAR 2012

DOI: 10.1002/cphc.201100960

Issue

ChemPhysChem

ChemPhysChem

Volume 13, Issue 6, pages 1557–1561, April 23, 2012

Additional Information

How to Cite

Li, S., Roy, A., Lichtenberg, H., Merchan, G., Kumar, C. S. S. R. and Köhler, J. M. (2012), Local Structure of ZnO Micro Flowers and Nanoparticles Obtained by Micro-Segmented Flow Synthesis. ChemPhysChem, 13: 1557–1561. doi: 10.1002/cphc.201100960

Author Information

  1. 1

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

  2. 2

    Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, Louisiana 70806 (USA)

  3. 3

    Center for Atomic Level Catalyst Design, Louisiana State University, Baton Rouge, LA 70803 (USA)

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

Publication History

  1. Issue published online: 16 APR 2012
  2. Article first published online: 7 MAR 2012
  3. Manuscript Received: 1 DEC 2011

Funded by

  • Stipendium der Landesgraduiertenförderung
  • Department of Energy
  • Office of Science
  • Office of Basic Energy Sciences. Grant Number: DE-SC0001058

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Keywords:

  • fluorescence spectroscopy;
  • micro-segmented flow;
  • nanoparticles;
  • X-ray absorption spectroscopy;
  • ZnO

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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