F. Boccuzzi, A. Chiorino, G. Ghiotti, Guglielminotti
{"title":"Infrared study of H2 sensing at 300 K using M/ZnO systems","authors":"F. Boccuzzi, A. Chiorino, G. Ghiotti, Guglielminotti","doi":"10.1016/0250-6874(89)87064-7","DOIUrl":null,"url":null,"abstract":"<div><p>Infrared spectra of Pt/ZnO in vacuum, in H<sub>2</sub> and O<sub>2</sub> are discussed in comparison with those of pure ZnO, Cu/ZnO and Ru/ZnO. An electron transfer from the ZnO donor centres is put in evidence. The growth of a strong absorption band in H<sub>2</sub> is due to the repopulation of the ZnO donor levels as a consequence of the spill-over of H atoms from the metal particles to ZnO, where they are adsorbed in protonic form. The rate of production and depletion of this absorption in H<sub>2</sub> and O<sub>2</sub> atmospheres indicates that the rate-determining steps in the room-temperature sensing are the dissociations of the molecules on the metal catalysts.</p></div>","PeriodicalId":101159,"journal":{"name":"Sensors and Actuators","volume":"19 2","pages":"Pages 119-124"},"PeriodicalIF":0.0000,"publicationDate":"1989-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0250-6874(89)87064-7","citationCount":"14","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Sensors and Actuators","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0250687489870647","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 14
Abstract
Infrared spectra of Pt/ZnO in vacuum, in H2 and O2 are discussed in comparison with those of pure ZnO, Cu/ZnO and Ru/ZnO. An electron transfer from the ZnO donor centres is put in evidence. The growth of a strong absorption band in H2 is due to the repopulation of the ZnO donor levels as a consequence of the spill-over of H atoms from the metal particles to ZnO, where they are adsorbed in protonic form. The rate of production and depletion of this absorption in H2 and O2 atmospheres indicates that the rate-determining steps in the room-temperature sensing are the dissociations of the molecules on the metal catalysts.
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