Graphene-Templated
Growth of Pd Nanoclusters
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Abstract
Graphene grown on Rh(111) was used
as a template for the growth
of Pd nanoclusters. Using high-resolution synchrotron radiation-based
X-ray photoelectron spectroscopy, we studied the deposition of Pd
on corrugated graphene in situ. From the XP spectra, we deduce a cluster-by-cluster
growth mode. The formation of clusters with 3 nm diameter was confirmed
by low-temperature scanning tunneling microscopy measurements. The
investigation of the thermal stability of the Pd particles showed
three characteristic temperature regimes: Up to 550 K restructuring
of the particles takes place, between 550 and 750 K the clusters coalesce
into larger agglomerates, and finally between 750 and 900 K Pd intercalates
between the graphene layer and the Rh surface
