Small amounts of Ce4+ions dispersed in the bulk of ZrO2give to this material unexpected properties ofphotoactivity under visible light. Three different samples have been synthesized following different meth-ods and using different precursors and all show some degree of photoactivity. This has been monitoredvia EPR spectroscopy in terms of charge separation (electrons and holes formation) under polychromaticlight having > 420 nm. This behaviour, unimaginable for bare zirconia due to the large band gap of thisoxide (around 5 eV), is possible because of the presence in the solid of empty 4f Ce states located in themiddle of the band gap which act as intermediate levels in a double excitation mechanism. The dopedoxide here described can be considered an example of third generation photoactive material operatingunder visible light.

Cerium doped zirconium dioxide as a potential new photocatalyticmaterial. The role of the preparation method on the propertiesof the material

GIONCO, CHIARA;PAGANINI, Maria Cristina;CHIESA, Mario;MAURELLI, SARA;LIVRAGHI, Stefano;GIAMELLO, Elio
2015-01-01

Abstract

Small amounts of Ce4+ions dispersed in the bulk of ZrO2give to this material unexpected properties ofphotoactivity under visible light. Three different samples have been synthesized following different meth-ods and using different precursors and all show some degree of photoactivity. This has been monitoredvia EPR spectroscopy in terms of charge separation (electrons and holes formation) under polychromaticlight having > 420 nm. This behaviour, unimaginable for bare zirconia due to the large band gap of thisoxide (around 5 eV), is possible because of the presence in the solid of empty 4f Ce states located in themiddle of the band gap which act as intermediate levels in a double excitation mechanism. The dopedoxide here described can be considered an example of third generation photoactive material operatingunder visible light.
2015
504
338
343
Photocatalysis, Charge separation, EPR spectroscopy
Gionco, Chiara; Paganini, Maria Cristina; Chiesa, Mario; Maurelli, Sara; Livraghi, Stefano; Giamello, Elio
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1530694
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