Metal oxide nanoparticles from inorganic sources via a simple and general method

摘要

A new, general, and simple method has been developed for the synthesis of metal oxide nanoparticles using generic chemicals. The method is based on the stabilizing of nanoparticles by capping their surface with organic ligands. ZrO_2 nanoparticles with an average particle size of 13 nm were synthesized using zirconium nitrate or zirconium oxychloride as the source material. The method was further applied for preparation of Co_3O_4, mixed oxides ZrO_2-Co_3O_4, ZrO_2-NiO, and ZrO_2-Co_3O_4-NiO. The metal oxides nanoparticles were highly crystalline and had a narrow particle-size distribution. XRD analysis of the zirconium oxide indicated that it was predominantly in the monoclinic phase, with a small fraction in the tetragonal phase. However, the phase of zirconia in the mixed oxides was a pure tetragonal one, owing to the existence of Ni and Co ions that could stabilize the metastable tetragonal phase.