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Role of Pt aggregates in Pt/SnO2 thin films used as gas sensors - Investigations of the catalytic effectстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Gaidi M., Hazemann J.L., Matko I., Chenevier B., Rumyantseva M., Gaskov A., Labeau M.
- Журнал: Journal of the Electrochemical Society
- Том: 147
- Номер: 8
- Год издания: 2000
- Издательство: Electrochemical Society, Inc.
- Местоположение издательства: United States
- Первая страница: 3131
- Последняя страница: 3138
- DOI: 10.1149/1.1393870
- Аннотация: Fine dispersions of metal aggregates such as Pt, Pd, or Cu in metal oxides are well known to improve the electrical sensitivity and selectivity of solid-state gas sensors put in contact with reducing gases (CO and H2S, for instance) of solid-state gas sensors. The improvement originates in the catalytic role played by the aggregates in regard to gas oxidation/reduction. The details of the solid-gas interactions are nevertheless not fully understood. To further investigate the role of Pr aggregates in the sensing mechanisms results of in situ X-ray absorption and Anger electron spectroscopy from Pt/SnO2 films have been combined. Films with a Pt concentration in the range 0.6-6 atom % have been prepared using a modified chemical vapor codeposition method. Results show that the sensing mechanism in mainly driven by the CO oxidation catalyzed by the aggregates: first a spillover effect occurs between CO, chemisorbsd oxygen, and PtOy aggregates, and in a second step, after a period of time depending on temperature, the aggregates are reduced/oxidized provided that they are small enough. The correlations between Pt particle behavior and film electric properties are discussed. (C) 2000 The Electrochemical Society. S0013-4651(00)01-035-1. All rights reserved.
- Добавил в систему: Румянцева Марина Николаевна