Enhanced Bonding of Silver Nanoparticles on Oxidized TiO2(110)

被引：29

作者：

Hansen, Jonas O. ^{[1
,2
]}

Lira, Estephania ^{[1
,2
]}

Galliker, Patrick ^{[1
,2
]}

Wang, Jian-Guo ^{[3
]}

Sprunger, Phillip T. ^{[4
]}

Li, Zheshen ^{[1
,2
]}

Laegsgaard, Erik ^{[1
,2
]}

Wendt, Stefan ^{[1
,2
]}

Hammer, Bjork ^{[1
,2
]}

Besenbacher, Flemming ^{[1
,2
]}

机构：

[1] Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[2] Aarhus Univ, Inst Storage Ring Facil ISA, DK-8000 Aarhus C, Denmark

[3] Zhejiang Univ Technol, Coll Chem Engn & Mat Sci, Hangzhou 310032, Zhejiang, Peoples R China

[4] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70808 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 40期

关键词：

SCANNING-TUNNELING-MICROSCOPY; DENSITY-FUNCTIONAL THEORY; VISIBLE-LIGHT PHOTOCATALYST; SUPPORTED GOLD CATALYSTS; TIO2; 110; SURFACE; CO OXIDATION; TITANIUM-DIOXIDE; ELECTRONIC-STRUCTURE; REDUCED TIO2(110); O-2; DISSOCIATION;

D O I：

10.1021/jp101714r

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The nucleation and growth of silver nanoclusters on TiO2(110) surfaces with on-top O adatoms (oxidized TiO2), surface O vacancies and H adatoms (reduced TiO2) have been studied. From the interplay of scanning tunneling microscopy/photoelectron spectroscopy experiments and density functional theory calculations, it is found that silver clusters are much more strongly bonded to oxidized TiO2(110) surfaces than to reduced TiO2(110) model supports. It is shown that electronic charge can be transferred from silver clusters to the oxidized TiO2(110) surface as evidenced by the reappearance of the Ti3d defect state upon silver exposure. Furthermore, from both scanning tunneling microscopy data and density functional theory calculations the most favorable adsorption site of silver monomers on oxidized TiO2(110) is one that bridges between on-top O adatoms and regular surface O atoms nearby.

引用

页码：16964 / 16972

页数：9

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