These experiments provide the first direct correlation between the presence of color centers on a singlecrystalline oxide surface, the nucleation of metal atoms to these centers, and the impact of the nucleation site on the properties of the metal particle as probed by the IR stretching frequency of adsorbed CO molecules. Based on the IR data it was shown that Au particles adsorbed to color centers are indeed charged as expected from theoretical predictions, while Au particles on regular terrace sites are neutral. In addition, we find good indications that the red shift of the stretching frequency for CO on negatively charged Au clusters is strongly dependent on the size of the Au particle as rationalized by simple electronic considerations.
Sterrer, M., Yulikov, M., Fischbach, E., Heyde, M., Rust, H., Pacchioni, G., et al. (2006). Interaction of gold clusters with color centers on MgO(001) films. ANGEWANDTE CHEMIE. INTERNATIONAL EDITION, 45(16), 2630-2632 [10.1002/anie.200504443].
Interaction of gold clusters with color centers on MgO(001) films
PACCHIONI, GIANFRANCO;
2006
Abstract
These experiments provide the first direct correlation between the presence of color centers on a singlecrystalline oxide surface, the nucleation of metal atoms to these centers, and the impact of the nucleation site on the properties of the metal particle as probed by the IR stretching frequency of adsorbed CO molecules. Based on the IR data it was shown that Au particles adsorbed to color centers are indeed charged as expected from theoretical predictions, while Au particles on regular terrace sites are neutral. In addition, we find good indications that the red shift of the stretching frequency for CO on negatively charged Au clusters is strongly dependent on the size of the Au particle as rationalized by simple electronic considerations.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
