Electron paramagnetic resonance (EPR) studies have been carried out on lattice oxygen vacancies produced by the interaction of carbon monoxide with SnO2 obtained by sol-gel type condensation. Under a 0.5% CO-argon reducing atmosphere the vacancies can transfer electrons to Sn4+ producing Sn2+ centres. In air the lattice defects interact with molecular oxygen in a manner which depends on whether the gas reducing treatment was performed under dry or moist conditions. Defects that undergo oxygen interaction at the SnO2 surface, reduce O-2 to O-2(-) or O2-, depending on the temperature of the reaction with oxygen.
Canevali, C., Chiodini, N., Dinola, P., Morazzoni, F., Scotti, R., Bianchi, C. (1997). Surface reactivity of SnO2 obtained by sol-gel type condensation: Interaction with inert, combustible gases, vapour-phase H2O and air, as revealed by electron paramagnetic resonance spectroscopy. JOURNAL OF MATERIALS CHEMISTRY, 7(6), 997-1002 [10.1039/a608608j].
Surface reactivity of SnO2 obtained by sol-gel type condensation: Interaction with inert, combustible gases, vapour-phase H2O and air, as revealed by electron paramagnetic resonance spectroscopy
CANEVALI, CARMEN;CHIODINI, NORBERTO;MORAZZONI, FRANCA;SCOTTI, ROBERTO;
1997
Abstract
Electron paramagnetic resonance (EPR) studies have been carried out on lattice oxygen vacancies produced by the interaction of carbon monoxide with SnO2 obtained by sol-gel type condensation. Under a 0.5% CO-argon reducing atmosphere the vacancies can transfer electrons to Sn4+ producing Sn2+ centres. In air the lattice defects interact with molecular oxygen in a manner which depends on whether the gas reducing treatment was performed under dry or moist conditions. Defects that undergo oxygen interaction at the SnO2 surface, reduce O-2 to O-2(-) or O2-, depending on the temperature of the reaction with oxygen.
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