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Estabilidad y propiedades de aglomerados subnanometricos de Cu sin encapsulantes

Impartida por el Profesor Félix Requejo

INIFTA-CONICET
La Plata, Argentina
 
ABSTRACT

Clusters seem to display stabilities that are greater than those of nanoparticles, as can be deduced by the fact that nanoparticles are etched in the presence of strong binding ligands to produce stable nanomaterials. On the other hand, clusters display a chemistry (highly dependent on cluster size) that is different than that of bulk or nanomaterials due to their different geometrical and electronic structure. It is interesting to note that, in general, a particular window of cluster sizes has been found to be the active species for a particular reaction 1-4 because of the strong dependence of the geometric and electronic structure on cluster size. Some representative examples are, for instance, Ag clusters for the propylene epoxidation by molecular oxygen,5 and Cu clusters have also been found to be the active species in some Cu-catalyzed reactions, such as selective hydrogenations.6 Thus, stability and structure configuration are key aspects to tune physicochemical properties of atomic quantum clusters (AQC). In this presentation, electrochemically obtained bare Cu20 AQC were studied by EXAFS and XANES. These AQC exhibit high stability with temperature and sensitivity to the support interaction.

Lugar:
Salón Actos ICP

Viernes 28 de Octubre 2016
10:30 h
 
Cultura Científica y Comunicación (ICP-CSIC)
CCC 2016/021
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