In situ simultaneous XAS and electrical characterizations of Pt-doped tin oxide thin film deposited by pyrosol method for gas sensors application
| Autor: | M. Labeau, J.L. Hazemann, Bernard Chenevier, Mounir Gaidi |
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| Rok vydání: | 2006 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Absorption spectroscopy Metals and Alloys Analytical chemistry Nanoparticle chemistry.chemical_element Chemical vapor deposition Condensed Matter Physics Tin oxide Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Electrical resistance and conductance Materials Chemistry Electrical and Electronic Engineering Thin film Platinum Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 120:313-315 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2006.02.021 |
| Popis: | Pt-doped polycrystalline tin oxide thin films have been synthesized by a modified chemical vapor deposition process using the pyrolysis of an aerosol generated by ultrahigh frequency spraying of a volatile precursor solution. We have analyzed the role played in the sensing processes, by Platinum aggregates dispersed in SnO 2 thin films used for the detection of various reducing gases such as CO or H 2 S. X-ray absorption spectroscopy (XAS) analysis has allowed us to follow in situ the evolution of the oxidation state of platinum aggregates. The effect of Pt nanoparticles on the CO and H 2 S sensitivity of SnO 2 thin films was studied in real working conditions using X-ray absorption spectroscopy (XAS) and electrical conductivity measurement. Under CO and when they are incorporated in a very weak quantity (which correspond to a very small particles), platinum particles change in a reversible manner, their oxidation state, according to the nature of the atmosphere. Different situation has been observed in the presence of H 2 S gas. |
| Databáze: | OpenAIRE |
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