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Titolo:
INTERPRETATION OF THE BINDING-ENERGY AND AUGER PARAMETER SHIFTS FOUNDBY XPS FOR TIO2 SUPPORTED ON DIFFERENT SURFACES
Autore:
MEJIAS JA; JIMENEZ VM; LASSALETTA G; FERNANDEZ A; ESPINOS JP; GONZALEZELIPE AR;
Indirizzi:
UNIV SEVILLA,CSIC,INST CIENCIA MAT,POB 1115 SEVILLE 41080 SPAIN UNIV SEVILLA,CSIC,INST CIENCIA MAT SEVILLE 41080 SPAIN DEPT QUIM INORGAN SEVILLE 41080 SPAIN
Titolo Testata:
Journal of physical chemistry
fascicolo: 40, volume: 100, anno: 1996,
pagine: 16255 - 16262
SICI:
0022-3654(1996)100:40<16255:IOTBAA>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXTRA-ATOMIC RELAXATION; PHOTOELECTRON-SPECTRA; ELECTROSTATIC MODEL; CHEMICAL-SHIFTS; SIZE; SPECTROSCOPY; INTERFACE; PARTICLES; OXIDATION; MECHANISM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
J.A. Mejias et al., "INTERPRETATION OF THE BINDING-ENERGY AND AUGER PARAMETER SHIFTS FOUNDBY XPS FOR TIO2 SUPPORTED ON DIFFERENT SURFACES", Journal of physical chemistry, 100(40), 1996, pp. 16255-16262

Abstract

In this paper the deposition of very thin films of TiO2 on different substrates (SiO2, MgO, Ag) is studied by XPS. Shifts in the Ti 2p BE and the Auger parameter of Ti (alpha' = Ti 2p BE + Ti L(3)M(23)V Auger KE) are observed on the three substrates. The magnitude and the sign of the shifts with respect to those of bulk TiO2 depend on coverage andon the type of substrate. In a parallel way, the magnitude of the energy gap of thin films of TiO2 changes depending on the substrate. Thishas been shown by UV-vis absorption spectroscopy for TiO2 deposited on SiO2 for a TiO2-Ag ''cermet'' (ceramic-metal thin film) and by photoemission with synchrotron radiation for TiO2 deposited on SiO2. It is proposed that the shift in the Auger parameter and the energy gap of TiO2 in these systems are two related parameters. Molecular orbital calculations (extended Huckel and INDO/1) with clusters simulating the TiO2-substrate interface explain qualitatively the variations in the Auger parameter and in the energy gap, The contribution of the polarization of the medium to the changes in the Auger parameter is approximatedwith an electrostatic model that accounts for the influence of the support in the observed shifts.

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Documento generato il 28/11/20 alle ore 20:40:49