학술논문
Improvement of a Real Gas-Sensor for the Origin of Methane Selectivity Degradation by µ-XAFS Investigation.
Document Type
Article
Author
Source
Subject
*REAL gases
*GAS detectors
*METHANE
*X-ray absorption
*FLUORIMETRY
*PALLADIUM
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Language
ISSN
2311-6706
Abstract
We have directly investigated the chemical state of the Pd species in a real μ-gas sensor device by examining the μ-fluorescence X-ray absorption fine structure. The μ-gas sensor device was heavily damaged by a heating process in which the temperature was ill-controlled, resulting in decrease of methane selectivity. We found that the PdO in the fresh μ-gas sensor was reduced to Pd metal particles as the methane selectivity decreased. Based on the investigation results, we modified the device structure so as to heat up homogeneously. The lifetime of the sensor was then successfully increased by more than 5 years. [ABSTRACT FROM AUTHOR]