ZnO nanostructures have been successfully prepared by dissolution-reprecipitation of micro-sized ZnO powder from aqueous ammonium hydrogencarbonate solution in the presence of thiourea, followed by calcination at 400 • C for 1 h. The products were characterized by simultaneous thermal analysis, xray diffraction, scanning electron microscopy, transmission electron microscopy, selected-area electron diffraction, and Fouriertransform infrared spectroscopy analysis. The results reveal that the morphology and particle size of the as-prepared ZnO samples are susceptible to the amount of added thiourea. The developed method has potential for application in industry due to simple processing and inexpensive reagents. INTRODUCTIONZinc oxide (ZnO), a wide-band-gap (3.37 eV) semiconductor, has high excition binding energy (60 mV) and a stable wurtzite structure with lattice spacing a = 0.325 nm and c = 0.521 nm. The lack of center of symmetry in wurtzite, combined with large electrochemical coupling, results in strong piezoelectric and pyroelectric properties. ZnO as a versatile material has attracted intensive research efforts due to its pyroelectric, piezoelectric, semiconductive, optical. and catalytic properties. [1,2] It is well known that the properties of zinc oxide depend on both size and morphology of the particles. Nanostructured ZnO exhibits numerous characteristics that may enable it for various applications, such as ultraviolet nanolasers, [3]

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