In this paper, we report a facile route for preparation of hexagonal ZnO nanocrystallites using aqueous solution of zinc acetate dihydrate (Zn (C2H3O2)(2)center dot 2H(2)O) with the aid of ultrasound irradiation. Scanning electron microscope (SEM) images display the product consisting of rod-like nanocrystallites of about 70 nm width and 250 nm length, which aggregated in the form of polydispersive clusters. X-ray diffraction analysis exhibits that the particles are excellently crystallized. The UV-vis absorption spectroscopy and Energy-dispersive X-ray analysis (EDAX) measurements of the as-prepared nanostructures were studied. (C) 2009 Elsevier Ltd. All rights reserved.