Journal of the Ceramic Society of Japan, Supplement
Online ISSN : 1349-2756
ISSN-L : 1349-2756
Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue
Session ID : 7
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H2 and NOx Sensing Properties of ZnO and In2O3 Powders Modified with Mesoporous SnO2
Takeo HYODOYutaro MITSUYASUYasuhiro SHIMIZUMakoto EGASHIRA
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Abstract
Improvement of H2 and NOx (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 NOx (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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© 2004 The Ceramic Society of Japan
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