Local structure of ZnO micro flowers and nanoparticles obtained by micro-segmented flow synthesis

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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. Flower flow: ZnO micro flowers (see picture) and nanoparticles are synthesized using the micro-segmented flow technique. They are investigated by extended X-ray absorption fine structure spectroscopy in order to understand the local atomic structure. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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