Abstract
The present work investigates the influence of ultrasonic irradiation on the properties of ZnO nanostructures. Slurries of ZnO prior formed by co-precipitation were irradiated by low-power ultrasound for different times. The properties of the samples were characterized by X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), Fourier transformed infrared (FTIR) absorption, scanning electron microscopy (SEM) and photoluminescence (PL). Ultrasonic waves induced significant variation in morphology of the particles. Needles, rods, rice-like and fragmented particles were detected in different treated samples. The irradiation also led to the formation of different types of point defects in the ZnO structure, varying in nature and density, which in turn affected the structural local ordering and luminescent efficiency. A possible growth mechanism of the particles is presented, and the type and origin of the formed point defects are discussed.
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