H2 and NOx Sensing Properties of ZnO and In2O3 Powders  Modified with Mesoporous SnO2

Takeo HYODO; Yutaro MITSUYASU; Yasuhiro SHIMIZU; Makoto EGASHIRA

doi:10.14852/jcersjsuppl.112.0.S540.0

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

Session ID : 7

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S540.0

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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

H₂ and NO_x Sensing Properties of ZnO and In₂O₃ Powders Modified with Mesoporous SnO₂

Takeo HYODO, Yutaro MITSUYASU, Yasuhiro SHIMIZU, Makoto EGASHIRA

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Keywords: Mesoporous material, Tin dioxide, Zinc oxide, Indium oxide, Hydrogen, NO_x, Gas sensor

CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

Improvement of H₂ and NO_x (NO and NO₂) sensitivities of ZnO and In₂O₃ was attempted by surface modification with mesoporous SnO₂ (m-SnO₂). The ZnO powder modified with m-SnO₂ (m-SnO₂(n)/ZnO, n: the number of cycles of the surface modification) exhibited larger pore diameter (6∼7 nm) and lower specific surface area (1∼3 m² g^-1) than those of m-SnO₂(n)/In₂O₃. H₂ sensitivity was not improved by the surface modification, but deteriorated in the case of m-SnO₂(n)/In₂O₃, whereas NO_x (especially NO₂) sensitivities of ZnO and In₂O₃ increased significantly by the surface modification. The response speeds to NO and NO₂ of m-SnO₂(3)/ZnO were fast and comparable to those of m-SnO₂(3)/In₂O₃. However, both sensors, especially m-SnO₂(3)/In₂O₃, exhibited slow recovery speeds. The difference in recovery speed between m-SnO₂(3)/ZnO and m-SnO₂(3)/In₂O₃ was suggested to reflect the different mesoporous structure of the m-SnO₂ particles loaded on the two oxide particles.

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