Tin oxide multilayer film with catalyst layer and method for forming same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsMasahito Hayamizu, Kazuya Shimada, Asuka Hirooka, Toshihiko Sakata
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Abstract
A method for forming a tin oxide multilayer film with a catalyst layer, the method including preparing a concentrated liquid in which a tin compound is dissolved in a polar solvent; diluting the concentrated liquid with the polar solvent and a fluoride solution to prepare a reaction liquid that is a stable divalent tin solution; immersing a substance to be treated in the reaction liquid to form a tin oxide layer on a surface of the substance to be treated; and immersing the substance to be treated having the tin oxide layer formed on the surface in a catalyst solution containing catalyst metal ions to form a catalyst layer on the tin oxide layer.
Claims10
A method for forming a tin oxide multilayer film with a catalyst layer, the method comprising:
- dissolving a fluoride in water to form a first liquid having a concentration of 0.3 M or more;
- preparing a concentrated liquid by mixing the first liquid with a tin compound, the concentrated liquid being prepared such that a fluorine ion concentration derived from the fluoride is 0.8 times or more, and 3 times or less, than a divalent tin ion concentration derived from the tin compound;
- diluting the concentrated liquid with water to prepare a reaction liquid that is a stable divalent tin solution having the fluorine ion concentration of 0.01M to 2.5M;
- immersing a substance to be treated in the reaction liquid to form a tin oxide layer having a thickness of 2 nm or more and 60 nm or less on a surface of the substance to be treated;
- and
- immersing the substance to be treated having the tin oxide layer formed on the surface in a catalyst solution containing catalyst metal ions to form a catalyst layer including the catalyst metal on the tin oxide layer;
- wherein
- the catalyst metal is a noble metal.
A method for forming a tin oxide multilayer film with a catalyst layer, the method comprising:
- dissolving a tin compound in a polar solvent other than water to prepare a concentrated liquid;
- diluting the concentrated liquid with a fluoride solution to prepare a reaction liquid that is a stable divalent tin solution having the fluorine ion concentration derived from the fluoride being 0.01M to 2.5M;
- immersing a substance to be treated in the reaction liquid to form a tin oxide layer having a thickness of 2 nm or more and 60 nm or less on a surface of the substance to be treated;
- and
- immersing the substance to be treated having the tin oxide layer formed on the surface in a catalyst solution containing catalyst metal ions to form a catalyst layer including the catalyst metal on the tin oxide layer;
- wherein
- the catalyst metal is a noble metal.
Dependencies are inferred from the claim text.