Abstract

In the present research work, the synthesis of Ni (OH)₂ and NiO nanoparticles with narrow size distribution and uniform shape, by complexation-precipitation method using ammonia as complexing agent, was investigated. The reactions were carried out at the temperature about 70°C in the solution and the precipitated nickel hydroxide precursor, in the form of the nanosized soft agglomerates, was calcined at 300 and 400°C. The hydroxide and the oxide samples were then characterized by XRD, SEM, and IR spectroscopy. The NiO particles obtained after calcination at 300°C, could preserve the size and shape of the precursor material, whereas, the one obtained after calcination at 400°C showed a slight change in the size and morphology of the particles. In general, the results indicate that using this method, Ni(OH)₂ and NiO nanoparticles, with homogeneity in size and shape, suitable for various applications, can be prepared.

Key words: Complexation-precipitation, Ni hydroxide/oxide, nanoparticles, synthesis, characterization.