JOINED STRUCTURE COMPRISING CUBE- OR QUADRATIC PRISM-SHAPED ROCK SALT-TYPE OXIDE NANOPARTICLE WITH FINE METAL PARTICLE, AND METHOD FOR PRODUCING SAME

摘要

The object is to provide a method of continuous gas-phase generation of a joined structure comprising a cube- or quadratic prism-shaped rock salt-type oxide nanoparticle and a metal nanoparticle, and having high crystallinity. The method is characterized in that alloy nanoparticles composed of a noble metal and a base metal so that a rock salt-type oxide is formable and having a particle size of 1 to 100 nm are generated in an inert gas and brought into contact with a hot oxidizing gas, while the nanoparticles are heated at a high temperature together with the inert gas, to oxidize a base metal component in the alloy nanoparticles floating in the gas, and to simultaneously allow phase separation of the metal component, whereby the joined structure comprising the cube- or quadratic prism-shaped rock salt-type oxide nanoparticle and the metal nanoparticle is obtained.