Patent ID: 7972539

Claim:
A process for producing a metallic-nanoparticle inorganic composite which comprises an oxide film formation step in which an oxide film having micropores is formed on a substrate by a sol-gel method in which a metal alkoxide is partly hydrolyzed by the action of an acid catalyst; a tin deposition step in which the oxide film is brought into contact with an acidic aqueous solution of tin chloride; an excess Sn 2+ ion removal step in which Sn 2+ ions are removed from the micropores; a metallic-nanoparticle deposition step in which the oxide film is brought into contact with an aqueous solution of a metal chelate to deposit metallic nanoparticles in the micropores; and an excess metal ion removal step in which metal ions are removed from the micropores thereby allowing for the subsequent formation of additional metallic nanoparticles.