On the basis of experimental evidence and DFT calculations, we propose a simple yet viable way to stabilize and chemically activate gold nanoclusters on MgO. First the MgO surface is functionalized by creation of trapped electrons, (H+)(e(-)) centers (exposure to atomic H or to H-2 under UV light, deposition of low amounts of alkali metals on partially hydroxylated surfaces, etc.); the second step consists in the self-aggregation of gold clusters deposited from the gas phase. The calculations show that the (H+)(e-) centers act both as nucleation and activation sites. The process can lead to thermally stable gold cluster anions whose catalytic activity is enhanced by the presence of an excess electron.

A route toward the generation of thermally stable Au cluster anions supported on the MgO surface

CHIESA, Mario;GIAMELLO, Elio
2008

Abstract

On the basis of experimental evidence and DFT calculations, we propose a simple yet viable way to stabilize and chemically activate gold nanoclusters on MgO. First the MgO surface is functionalized by creation of trapped electrons, (H+)(e(-)) centers (exposure to atomic H or to H-2 under UV light, deposition of low amounts of alkali metals on partially hydroxylated surfaces, etc.); the second step consists in the self-aggregation of gold clusters deposited from the gas phase. The calculations show that the (H+)(e-) centers act both as nucleation and activation sites. The process can lead to thermally stable gold cluster anions whose catalytic activity is enhanced by the presence of an excess electron.
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CATALYTICALLY ACTIVE GOLD; CO OXIDATION; LOW-TEMPERATURE; OXIDE SURFACES; MGO(100) SURFACE; MOLECULAR-OXYGEN; ROOM-TEMPERATURE; ELECTRON TRAPS; COLOR-CENTERS; IONIC OXIDE
Pacchioni G; Sicolo S; Di Valentin C ; Chiesa M; Giamello E
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/51188
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