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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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2013-10, Vol.15 (41), p.17938-17946
Main Authors: Murata, Naoyoshi, Suzuki, Takuya, Kobayashi, Makoto, Togoh, Fumiaki, Asakura, Kiyotaka
Format: Article
Language:English
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.
ISSN:1463-9076
1463-9084
DOI:10.1039/c3cp52490f