Platinum group nanoparticle dispersion liquid and platinum group nanoparticle

摘要

PROBLEM TO BE SOLVED: To provide a platinum group nanoparticle dispersion high in purity by reducing involuntary contamination of materials at lower cost, and platinum group nanoparticles obtained by the dispersion.SOLUTION: The platinum group nanoparticle dispersion has a water-in oil (W/O) type microemulsion where a water phase is dispersed in an oil phase and a platinum group nanoparticle contained in the water phase. The platinum group nanoparticle has average particle diameter based on an electron microscope observation of 2 nm to 3nm and 70 mass% or more is included in a particle size range of average particle diameter±1 nm.SELECTED DRAWING: Figure 2