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Sensors 2011, 11(2), 1261-1276; doi:10.3390/s110201261
Article

Preparation of Mesoporous and/or Macroporous SnO2-Based Powders and Their Gas-Sensing Properties as Thick Film Sensors

1
,
2
,
2,*  and 2
1 Graduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan 2 Faculty of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
* Author to whom correspondence should be addressed.
Received: 13 December 2010 / Revised: 10 January 2011 / Accepted: 19 January 2011 / Published: 25 January 2011
(This article belongs to the Special Issue Gas Sensors - 2010)
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Abstract

Mesoporous and/or macroporous SnO2-based powders have been prepared and their gas-sensing properties as thick film sensors towards H2 and NO2 have been investigated. The mesopores and macropores of various SnO2-based powders were controlled by self-assembly of sodium bis(2-ethylhexyl)sulfosuccinate and polymethyl-methacrylate (PMMA) microspheres (ca. 800 nm in diameter), respectively. The introduction of mesopores and macropores into SnO2-based sensors increased their sensor resistance in air significantly. The additions of SiO2 and Sb2O5 into mesoporous and/or macroporous SnO2 were found to improve the sensing properties of the sensors. The addition of SiO2 into mesoporous and/or macroporous SnO2 was found to increase the sensor resistance in air, whereas doping of Sb2O5 into mesoporous and/or macroporous SnO2 was found to markedly reduce the sensor resistance in air, and to increase the response to 1,000 ppm H2 as well as 1 ppm NO2 in air. Among all the sensors tested, meso-macroporous SnO2 added with 1 wt% SiO2 and 5 wt% Sb2O5, which were prepared with the above two templates simultaneously, exhibited the largest H2 and NO2 responses.
Keywords: mesopore; macropore; meso-macropore; SnO2 gas sensors; SiO2; Sb2O5 mesopore; macropore; meso-macropore; SnO2 gas sensors; SiO2; Sb2O5
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Yuan, L.; Hyodo, T.; Shimizu, Y.; Egashira, M. Preparation of Mesoporous and/or Macroporous SnO2-Based Powders and Their Gas-Sensing Properties as Thick Film Sensors. Sensors 2011, 11, 1261-1276.

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