CORE-SHELL METAL NANOPARTICLES, AND METHOD FOR PRODUCING CORE-SHELL METAL NANOPARTICLES

An object of the present invention is to provide core-shell type metal nanoparticles having a high surface coverage of the core portion with the shell portion, and a method for producing the same. Disclosed is core-shell type metal nanoparticles comprising a core portion and a shell portion covering the core portion, wherein the core portion comprises a core metal material selected from metals and alloys, and wherein the shell portion comprises an alloy of a first shell metal material and a second shell metal material.