US 12,458,961 B2
Tin oxide multilayer film with catalyst layer and method for forming same
Masahito Hayamizu, Aichi (JP); Kazuya Shimada, Aichi (JP); Asuka Hirooka, Osaka (JP); and Toshihiko Sakata, Nara (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 18/873,950
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Dec. 27, 2023, PCT No. PCT/JP2023/046970
§ 371(c)(1), (2) Date Dec. 11, 2024,
PCT Pub. No. WO2024/143480, PCT Pub. Date Jul. 4, 2024.
Claims priority of application No. 2022-212501 (JP), filed on Dec. 28, 2022.
Prior Publication US 2025/0161928 A1, May 22, 2025
Int. Cl. B01J 23/14 (2006.01); B01J 23/62 (2006.01); B01J 37/02 (2006.01); C23C 18/16 (2006.01); C23C 18/18 (2006.01); C23C 18/42 (2006.01)
CPC B01J 37/0244 (2013.01) [B01J 23/14 (2013.01); B01J 23/626 (2013.01); B01J 37/0228 (2013.01); C23C 18/1651 (2013.01); C23C 18/1882 (2013.01); C23C 18/42 (2013.01)] 10 Claims
OG exemplary drawing
 
1. 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.