Ag nanoparticles have been deposited on stoichiometric and or reduced thin CeO2 films grown on Pt(111). The nucleation and growth of the Ag nanoparticles has been characterized by STM and XPS (X-ray photoemission spectroscopy) measurements complemented with DFT calculations on Ag atoms, clusters, and extended layers deposited on slab models of the CeO2(111) surface. The XPS spectra clearly show a reduction of the ceria support by Ag deposition (formation of Ce3+ ions). This is accompanied by a positive shift of the Ag 3d core levels, in which final state effects related to the finite size of the Ag deposits come into play. The DFT calculations support the view of a direct electron transfer from the Ag clusters and nanoparticles to the ceria support. Other possible origins of the reduction of the ceria substrate, like the occurrence of oxygen reverse spillover on the Ag nanoparticles, are ruled out based on energy considerations.

Luches, P., Pagliuca, F., Valeri, S., Illas, F., Preda, G., Pacchioni, G. (2012). Nature of Ag Islands and Nanoparticles on the CeO2(111) Surface. JOURNAL OF PHYSICAL CHEMISTRY. C, 116(1), 1122-1132 [10.1021/jp210241c].

Nature of Ag Islands and Nanoparticles on the CeO2(111) Surface

PREDA, GLORIA;PACCHIONI, GIANFRANCO
2012

Abstract

Ag nanoparticles have been deposited on stoichiometric and or reduced thin CeO2 films grown on Pt(111). The nucleation and growth of the Ag nanoparticles has been characterized by STM and XPS (X-ray photoemission spectroscopy) measurements complemented with DFT calculations on Ag atoms, clusters, and extended layers deposited on slab models of the CeO2(111) surface. The XPS spectra clearly show a reduction of the ceria support by Ag deposition (formation of Ce3+ ions). This is accompanied by a positive shift of the Ag 3d core levels, in which final state effects related to the finite size of the Ag deposits come into play. The DFT calculations support the view of a direct electron transfer from the Ag clusters and nanoparticles to the ceria support. Other possible origins of the reduction of the ceria substrate, like the occurrence of oxygen reverse spillover on the Ag nanoparticles, are ruled out based on energy considerations.
Articolo in rivista - Articolo scientifico
ceo2, DFT calculations, Ag nanoparticles
English
2012
116
1
1122
1132
none
Luches, P., Pagliuca, F., Valeri, S., Illas, F., Preda, G., Pacchioni, G. (2012). Nature of Ag Islands and Nanoparticles on the CeO2(111) Surface. JOURNAL OF PHYSICAL CHEMISTRY. C, 116(1), 1122-1132 [10.1021/jp210241c].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/31459
Citazioni
  • Scopus 95
  • ???jsp.display-item.citation.isi??? 95
Social impact