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Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, USA
E-mail: xuy2@ornl.gov.
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b
Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, USA
E-mail: goodman@mail.chem.tamu.edu.
; Fax: +1-979-845-6822
; Tel: +1-979-845-0214
Faraday Discuss., 2011,152, 267-276
DOI:
10.1039/C1FD00030F
Received
02 Mar 2011,
Accepted
06 May 2011
First published online
27 Jul 2011
Au deposited on Ru(0001)-supported extended, continuous graphene moiré forms large 2-D islands at room temperature that are several nanometers in diameter but only 0.55 nm in height, in the apparent absence of typical binding sites such as defects and adsorbates. These Au islands conform to the corrugation of the underlying graphene and display commensurate moiré patterns. Several extended Au structure models on graphene/Ru(0001) are examined using density functional theory calculations. Close-packed Au overlayers are energetically more stable, but all interact weakly with the support. Preliminary tests found the Au islands/graphene/Ru(0001) surface to be active for COoxidation at cryogenic temperature, which suggests that the Au itself is the locus of catalytic activity.
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