Microstructure and CO gas sensing property of Au/SnO2 core–shell structure nanoparticles synthesized by precipitation method and microwave-assisted hydrothermal synthesis method

Au/SnO2 core–shell structure NPs were prepared by a precipitation method and a microwave hydrothermal synthesis method, and their CO responses were measured by a high resistance meter. It was found that the CO response of the sample prepared by the precipitation method was extremely low, 0.18, with...

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Bibliographic Details
Published inSensors and actuators. B, Chemical Vol. 166-167; pp. 31 - 35
Main Authors Yanagimoto, T., Yu, Y.-T., Kaneko, K.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 20.05.2012
Subjects
Au/SnO2
Carbon monoxide
catalysts
CO gas response
Core-shell structure
Gold
lead
microstructure
microwave treatment
nanoparticles
oxidation
Porosity
Precipitation
Synthesis
TEM
Three-dimensional electron tomography
Tin dioxide
Tin oxides
tomography
transmission electron microscopy
Au/SnO2
TEM
Three-dimensional electron tomography
CO gas response
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Summary:Au/SnO2 core–shell structure NPs were prepared by a precipitation method and a microwave hydrothermal synthesis method, and their CO responses were measured by a high resistance meter. It was found that the CO response of the sample prepared by the precipitation method was extremely low, 0.18, with comparison to the one by the hydrothermal synthesis method, 0.965. Microstructures achieved by two-dimensional TEM characterization showed that both samples maintained the similar core–shell structures with their sizes ranging between 30 and 50nm, as the core consists of Au NP and the shell consists of SnO2 NPs. The average grain sizes of SnO2 NPs of precipitation method and hydrothermal synthesis method were measured as 5.2nm and 8.3nm, respectively. The thickness and the porosity variation of SnO2-shell layers were characterized further by three-dimensional electron tomography, and correlated with the sensing properties. It was found that the porosity within SnO2-shell layers prepared by the precipitation method was lower than the one prepared by the hydrothermal synthesis method. Since Au NP could act as the catalyst for CO oxidation reaction, high porosity within SnO2-shell layers would have lead the accessibilities of Au NP to the CO gas molecules and resulted high CO responses.
Bibliography:http://dx.doi.org/10.1016/j.snb.2011.11.047
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2011.11.047