| 摘要 |
A process for producing core/shell composite nanoparticles having excellent properties by forming shells on the surface of nanoparticles, as cores, which have been heat-treated while preventing sintering and have a specific crystal structure. In the process, a highly adhesive dispersant, e.g., a phase-transfer catalyst, is prevented from inhibiting the shell formation reaction. The process, which is for producing core/shell composite nanoparticles each comprising a shell and a nanometer-size core particle coated therewith, comprises: adding a polar solvent to a first solution comprising core particles which have undergone a heat treatment for forming a crystal structure for imparting necessary properties and a first organic solvent in which the core particles are dispersed with a first dispersant; separating and removing the first dispersant from the core particles by the solvent addition and agglomerating the nanoparticles; recovering the agglomerates; dispersing the recovered core particles in a second organic solvent with a second dispersant to form a second solution; and adding a precursor for the shells to the second solution to form the shells on the surface of the core particles.
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