Title
Direct observation of luminescent silver clusters confined in faujasite zeolites Direct observation of luminescent silver clusters confined in faujasite zeolites
Author
Faculty/Department
Faculty of Applied Economics
Faculty of Sciences. Physics
Publication type
article
Publication
Subject
Physics
Chemistry
Source (journal)
ACS nano
Volume/pages
10(2016) :8 , p. 7604-7611
ISSN
1936-0851
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
One of the ultimate goals in the study of metal clusters is the correlation between the atomic-scale organization and their physicochemical properties. However, direct observation of the atomic organization of such minuscule metal clusters is heavily hindered by radiation damage imposed by the different characterization techniques. We present direct evidence of the structural arrangement, at an atomic level, of luminescent silver species stabilized in faujasite (FAU) zeolites using aberration-corrected scanning transmission electron microscopy. Two different silver clusters were identified in Ag-FAU zeolites, a trinuclear silver species associated with green emission and a tetranuclear silver species related to yellow emission. By combining direct imaging with complementary information obtained from X-ray powder diffraction and Rietveld analysis, we were able to elucidate the main differences at an atomic scale between luminescent (heat-treated) and nonluminescent (cation-exchanged) Ag-FAU zeolites. It is expected that such insights will trigger the directed synthesis of functional metal nanoclusterzeolite composites with tailored luminescent properties.
Handle