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Chemical Reactivity of Pd-Au Bimetallic Nanoclusters Grown via Amorphous Solid Water as Buffer Layer

Summary: Chemical Reactivity of Pd-Au Bimetallic Nanoclusters Grown via Amorphous Solid Water
as Buffer Layer
Elad Gross,
Inna Popov,
and Micha Asscher*,
Institute of Chemistry and The HarVey M. Krueger Family Center for Nanoscience and Nanotechnology,
The Hebrew UniVersity of Jerusalem, Jerusalem 91904, Israel
ReceiVed: August 6, 2009; ReVised Manuscript ReceiVed: September 14, 2009
Bimetallic Pd-Au nanoclusters were prepared on SiO2/Si(100) via amorphous solid water (ASW) as buffer
layer. Selective growth pathways have led to segregated palladium and gold clusters or alloy bimetallic
crystallites. Morphology and chemical composition were determined by AFM, SEM, and HR-TEM coupled
to EDX analysis. Correlation between clusters morphology and composition to their chemical reactivity is
reported for the first time. Temperature programmed reaction studies revealed that conversion of acetylene to
ethylene and trimerization to benzene are significantly enhanced over crystalline alloy Pd-Au clusters when
compared to clean Pd. A remarkable selectivity toward ethylene formation over benzene is unique to the
alloy bimetallic clusters grown via ASW buffer layer on silica, presumably due to suppression of the
trimerization pathway. The intrinsic, modified electronic properties of the bimetallic alloy clusters are believed
to drive their enhanced chemical reactivity when compared with the pure Pd clusters.
1. Introduction
Supported bimetallic nanoclusters have been at the focus of


Source: Asscher, Micha - Institute of Chemistry, Hebrew University of Jerusalem


Collections: Chemistry