Patent ID: 8658251

Claim:
A method of producing a structural member having Prussian blue-type metal complex nanoparticles, the method comprising the steps of: providing a substrate; preparing a dispersion liquid comprising nanoparticles consisting of Prussian blue-type metal complex, the nanoparticles having been dispersible in water, wherein the dispersion liquid further comprises a medium selected from the group consisting of a water medium, an alcoholic solvent, and mixtures thereof; wherein the dispersion liquid is prepared via the following preparation process: coating the substrate with the dispersion liquid; and drying the medium of the dispersion liquid so as to provide a film of the water dispersible nanoparticles on the substrate; stabilizing the nanoparticles in accordance with a step selected from the following a to d, a: providing a surface of the substrate to be provided with the nanoparticles, the surface comprising an atom M S having the work function of 4.5 eV or more; b: giving an electrochemical treatment to the nanoparticles; c: giving a treatment by an agent containing an ion of a metal or metal complex to the nanoparticles; d: giving a heat treatment to the nanoparticles; wherein the preparation process of the dispersion liquid further comprises the steps of: preparing a crystal of the Prussian blue-type metal complex in which a cyano group CN forms a bridge between a metal atom M A and a metal atom M B ; and subjecting the crystal to a surface treatment with a metal cyano complex anion including a metal atom M C as a central metal and/or with a metal ion M D ; wherein M A is at least one metal atom selected from the group consisting of vanadium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, nickel, platinum, and copper; M B is at least one metal atom selected from the group consisting of vanadium, chromium, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, copper, silver, zinc, lanthanum, europium, gadolinium, lutetium, barium, strontium, and calcium; M C is at least one kind of metal atom selected from the group consisting of vanadium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, nickel, platinum, and copper; M D is at least one kind of metal atom selected from the group consisting of vanadium, chromium, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, copper, silver, zinc, lanthanum, europium, gadolinium, lutecium, barium, strontium, and calcium.