Growth and properties of ZnO nanoblade and nanoflower prepared by ultrasonic pyrolysis

  • Sun H
  • Kim G
  • Jung Y
 et al. 
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Abstract

ZnO nanoblades and nanoflowers are synthesized using zinc acetate dihydrate Zn ( C H 3 C O O ) 2 ∙ 2 H 2 O dissolved in distilled water by ultrasonicpyrolysis at 380 – 500 ° C . Thermogravimetry-differential scanning calorimetry, x-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, Raman spectroscopy, and low-temperature photoluminescence(PL) were used to characterize the thermal properties, crystalline and optical features of the ZnOnanostructures. The results showed that at 400 ° C the formation of nanoblades resulted from the simultaneous precipitation and nucleation in zinc acetate precursor. At an elevated temperature of 450 ° C , decomposition was almost advanced and thus the size of nanopetal became smaller and aggregates became larger by as much as 60 nm . The formation of aggregates is explained in terms of random nucleation model. Through PL measurement, nanoblade showed a strong near band-edge emission with negligible deep-level emission and free exciton band-gap energy E g ( 0 ) = 3.372 eV and Debye temperature β = 477 ± 65 K by the fitting curve of free exciton peak as a function of temperature to Varshni equation, E g ( T ) = E g ( 0 ) − α T 2 ∕ ( β + T ) , which are very close to bulk ZnO.

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