Stabilized nanoparticles of zinc peroxide were formed by a novel and simple technique. The technique is based on oxidation-hydrolysis-precipitation procedure, using zinc acetate as a precursor. The oxidizer was hydrogen peroxide and water was used for hydrolysis and as a preparation medium. The surface modifier was polyethylene glycol 200 (PEG200). ZnO2 was identified and studied by a variety of characterization techniques, including DLS, XRD, DSC, and TEM. Quite stable nanoparticles of ZnO were also obtained from the peroxide powder by heat treatment. The transition temperature, 233 degrees C, was determined by DSC. (C) 2007 Elsevier B.V. All rights reserved.