Characterization of Pt-doped SnO2 catalyst for a high-performance micro gas sensor

• Published in: Physical 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
• Language: English
• Published: Cambridge Royal Society of Chemistry 07.11.2013
• Subjects: Catalysis; Chemistry; Exact sciences and technology; General and physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Characterization; Binary compound; Tin oxide; Catalyst; Measurement sensor
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/c3cp52490f

The atomic scale structure and its dependence on Pt concentration of a Pt-doped SnO2 (Pt-SnO2) 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-SnO2 has a rutile structure similar to SnO2 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-SnO2 films. The Pt-SnO2 structure became amorphous at greater than 11 at% Pt. We found a good correlation between the methane activity and local structure of Pt.