Characterization of Pt-doped SnO sub(2) catalyst for a high-performance micro gas sensor

The atomic scale structure and its dependence on Pt concentration of a Pt-doped SnO sub(2) (Pt-SnO sub(2)) thin film produced by a sputter-deposition method was investigated, which showed high-performance as a methane gas sensor. Extended X-ray absorption fine structure (EXAFS) and X-ray diffraction...

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Published inPhysical chemistry chemical physics : PCCP Vol. 15; no. 41; pp. 17938 - 17946
Main Authors Murata, Naoyoshi, Suzuki, Takuya, Kobayashi, Makoto, Togoh, Fumiaki, Asakura, Kiyotaka
Format Journal Article
LanguageEnglish
Published 01.10.2013
Subjects
Atomic structure
Gas sensors
Methane
Platinum
Rutile
Tin dioxide
Tin oxides
X-rays
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Summary:The atomic scale structure and its dependence on Pt concentration of a Pt-doped SnO sub(2) (Pt-SnO sub(2)) thin film produced by a sputter-deposition method was investigated, which showed high-performance as a methane gas sensor. Extended X-ray absorption fine structure (EXAFS) and X-ray diffraction (XRD) analyses showed that Pt-SnO sub(2) has a rutile structure similar to SnO sub(2) crystals at less than 10 at% Pt where the Pt ion was located at the Sn position in the rutile structure. There was no evidence that Pt metal clusters were formed in the Pt-SnO sub(2) films. The Pt-SnO sub(2) structure became amorphous at greater than 11 at% Pt. We found a good correlation between the methane activity and local structure of Pt.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c3cp52490f