Abstract
The influence of experimental conditions on the precipitation of ZnO particles and their microstructural properties has been investigated using X-ray powder diffraction, Fourier transform infrared spectroscopy and thermal field emission scanning electron microscopy. Mixing of ZnCl 2 or Zn(ac) 2 solution with Na 2CO 3 solution of proper concentrations yielded aggregates of fine Zn 5(CO 3) 2(OH) 6 particles, which were converted to nanosize ZnO particles at 300 °C. The size of these ZnO particles increased to around 100 nm upon heating at 600 °C, whereas a small fraction of them turned out in the form of aggregates. The obtained ZnO particles assumed a pseudospherical shape; however, their basic structure was based on the hexagonal space group. Precipitation of Zn 2+ ions in decomposing HMTA at 90 °C yielded ZnO particles around micron range. Crystalline Zn(OH) 2 was not detected in the precipitates. ZnO particles obtained by this method were strongly elongated in the direction of the crystallographic c-axis.
Published Version
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