Hydrophilic Layered SiO2/TiO2/WO3 Thin Film for Indoor Anti-Fogging Coatings

Masahiro MIYAUCHI; Mitsuhide SHIMOHIGOSHI; Kazuhito HASHIMOTO

doi:10.14852/jcersjsuppl.112.0.S1414.0

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue

Session ID : 20-II

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S1414.0

Conference information

Host: The Ceramic Society of Japan

Co-host: Iketani Science and Technology Foundation, International Ceramic Federation, Commemorative Organization for the Japan World Exposition '70, The American Ceramic Society, The Australasian Ceramic Society, The Chinese Ceramic Society, The Korean Ceramic Society, Joint Research Consortium of Synergy Ceramics/Fine Ceramics Research Association, Nanotechnology Researchers Network Center of Japan, The Special Coordination Funds for Promoting Science and Technology, Japan National Tourist Organization, Aichi Prefectural Government, CASIO SCIENCE PROMOTION FOUNDATION, DAIKO FOUNDATION, Nagoya Convention and Visitors Bureau, The Asahi Glass Foundation, The Kao Foundation For Arts And Sciences, The Murata Science Foundation, The Ogasawara Foundation for the Promotion of Science & Engineering, ASAHI GLASS CO., LTD. Research Center, CENTRAL GLASS CO., LTD., ELECTRIC GLASS INDUSTRY ASSOCIATION OF JAPAN (EGAJ), Hattori Company, Ltd., Hitachi Research Laboratory, Hitachi, Ltd., HOYA CORPORATION, INAX Corporation, ITOCHU CERATECH CORP., Japan Cement Association, KYOCERA Corporation, KYUSHU REFRACTORIES CO., LTD., MINO CERAMIC CO., LTD., Murata Manufacturing Co., Ltd., NGK INSULATORS LTD., NGK SPARK PLUG CO., LTD., NICHIAS Corporation, NIKKO COMPANY, Nippon Electric Glass Co., Ltd., Nippon Sheet Glass Co., Ltd., NORITAKE CO., LIMITED, Tokuyama Corporation, TOTO LTD.

Papers

Hydrophilic Layered SiO₂/TiO₂/WO₃ Thin Film for Indoor Anti-Fogging Coatings

Masahiro MIYAUCHI, Mitsuhide SHIMOHIGOSHI, Kazuhito HASHIMOTO

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Keywords: Photocatalyst, Hydrophilicity, Thin film, TiO₂, WO₃, SiO₂

CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

The effect of silica (SiO₂) addition to the TiO₂/WO₃ system for the surface wettability and photocatalytic property was evaluated. Two kinds of structures for SiO₂/TiO₂/WO₃ films were fabricated, i.e., colloidal silica was deposited on the surface of TiO₂/WO₃/Pyrex substrate (sample A), and a composite layer of TiO₂ particles and SiO₂ binder was coated on the WO₃ film (sample B). These films exhibited highly hydrophilic surface under the dark in clean air for a long term (65 days). The photocatalytic oxidation of methylene blue adsorbed onto the surface was investigated, and as a result, the sample A exhibited the highest oxidation activity. The high activity of sample A was due to the efficient charge separation between TiO₂ and WO₃, whereas the charge transfer was retarded by the insulating SiO₂ binder in sample B. The sample A exhibited the excellent sustainability of hydrophilicity and the anti-fogging property for a long term (100 days) under the indoor atmosphere.

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