Preparation of nano-NiO by ammonia precipitation and reaction in solution and competitive balance

Nano-NiO particles have been synthesized at room temperature via single-phase precipitation, using NiCl2.6H(2)O and NH3.H2O as the raw materials and H2O as solvent. It has been indicated by X-ray diffraction (XRD) and X-ray fluorescence (XRF) analysis as well as transmission electron microscopy (TEM) analysis that nano-NiO particles have cubic crystal structure with about 9 nm of average diameter and 99.73% of purity. Compared with conventional methods, the developed method is simple and inexpensive so that it has potential for further scale-up application in industry. The key factor is how to control the chemical reaction in solution and competitive balance. This paper has discussed these aspects. (C) 2003 Elsevier B.V. All rights reserved.