Effects of microstructure of mesoporous SnO2 powders on their H2 sensing properties

SENSORS AND ACTUATORS B-CHEMICAL

卷:141

Article

Hayashi, Masahiro¹  Hyodo, Takeo¹  Shimizu, Yasuhiro²  Egashira, Makoto² 

[1] Nagasaki Univ, Grad Sch Sci & Technol, Fac Engn, Nagasaki 8528521, Japan

[2] Nagasaki Univ, Dept Mat Sci & Engn, Fac Engn, Nagasaki 8528521, Japan

关键词: Tin dioxide;    Mesopores;    Particle size;    Hydrogen;    Gas sensor;   

DOI  :  10.1016/j.snb.2009.07.035

来源: Elsevier

【 摘 要 】

Various mesoporous tin dioxide (m-SnO2) powders were prepared from two kinds of combination of a tin source and a surfactant template, and their H-2 sensing properties were investigated. The specific surface area and pore volume of the m-SnO2 powder prepared from Na2SnO3 center dot 3H(2)O as a tin source and n-cetylpyridinium chloride monohydrate (C16PyCl;(C5H5NC16H33)Cl center dot H2O) as a template under a fixed pH value of 10(m-SnO2(1)) were larger than those of the m-SnO2 powders prepared from SnCl4 center dot 5H(2)O as a tin source and aerosol-OT (AOT; C20H37O7SNa) as a template under different pH conditions (m-SnO2(2)-n; n is the value of pH of the precursor solution). However, the specific surface area of m-SnO2(1) decreased drastically by post-grinding, while m-SnO2(2)-n powders with small secondary agglomerates showed only a slight decrease in specific surface area during post-grinding. In addition, m-SnO2(2)-n sensors exhibited better H-2 response and lower resistance than those of m-SnO2(1)) sensor, especially at low operating temperatures, probably because of moderately developed mesopores which promoted easier diffusion of H-2 to the most sensitive region of the surface of SnO2 particles. (C) 2009 Elsevier B.V. All rights reserved.

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