Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7144708 | Sensors and Actuators B: Chemical | 2016 | 34 Pages |
Abstract
The response of a neat tin oxide device to hydrogen gas in air was analyzed in detail, shedding light on the surface chemistry involved. The response was clearly divided into two categories depending on the partial pressure of hydrogen (PH2), one in which the response was controlled by the reaction of O2â ions (at small PH2) and another in which the response was by that of Oâ ions (at higher PH2). Typical of the former category, a threshold PH2 appeared, indicating that the Oâ ions had been produced transiently through the reaction of O2â ions. Interestingly, a considerable amount of O2â ions was shown to persist even in the stage of the latter category, leading to an increase in resistance. Mechanism of switching between the two categories, the persistent amount of O2â ions and the meaning of the threshold PH2 could be accounted for satisfactorily based on the diagram of partition of the transferred electrons between Oâ and O2â. The characteristic quantities of the response in the two categories were evaluated.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Noboru Yamazoe, Koichi Suematsu, Kengo Shimanoe,