| 摘要 |
The present invention is intended to provide a gas sensor that can detect low concentration NO2 at a few ppb level with high sensitivity, and adapted to at least include: a silver catalyst member that is provided with a flow path through which a sample gas can pass, wherein at least on a surface of the flow path, silver is exposed; a first semiconductor gas sensor element that is provided with a gas sensitive film including n-type oxide semiconductor; and a main flow path that communicatively connects between the silver catalyst member and the first semiconductor gas sensor element, to let the sample gas flow from the silver catalyst member toward the first semiconductor gas sensor element.
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