Surface Defect-Mediated Reactivity of Au/TiO₂(110)

Conference · Sat Jan 01 04:00:00 EST 2005

OSTI ID:1003114

Park, Ken T. ^[1]; Pan, Minghu ^[2]; Meunier, Vincent ^[2]; Shelton, Jr, William Allison ^[2]; Kalinin, Sergei V ^[2]; Baddorf, Arthur P ^[2]; Plummer, E Ward ^[2]

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1. University of Tennessee, Knoxville (UTK) & Baylor University, Waco
2. ORNL

The novel properties of metal clusters supported by transition metal oxides originate from the specific interactions of metal clusters mediated by an oxide substrate, including local reduction below the cluster. In this work, we present recent results on the interactions between line defects on a TiO{sub 2}(110) and their reactivity toward Au nano-particles studied by a combination of Scanning Tunneling Microscopy and Spectroscopy. High-resolution STM images, interpreted with first-principles theory, show that the observed one-dimensional strands have partially reduced Ti atoms coordinated at oxygen octahedral sites. When gold nano-particles of diameters 5 nm and less are deposited on the sub-stoichiometric rows of TiO{sub x}, the strands, like point defects and step edges on TiO{sub 2}(110), serve as nucleation sites for gold nano-clusters. Further reactions of the Au/TiO{sub 2} system with O{sub 2} and CO are discussed.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: ORNL LDRD Director's R&D
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1003114
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMS
GOLD
IMAGES
INTERACTIONS
LINE DEFECTS
MATERIALS
MEETINGS
METALS
NUCLEATION
OXIDES
OXYGEN
POINT DEFECTS
REACTIVITY
REDUCTION
SCANNING TUNNELING MICROSCOPY
SPECTROSCOPY
SPRINGS
SURFACES
TRANSITION ELEMENTS