Dopant Location, Local Structure, and Electronic Properties of Au24Pt(SR)18 Nanoclusters

被引：99

作者：

Christensen, Stephen L. ^{[1
]}

MacDonald, Mark A. ^{[1
]}

Chatt, Amares ^{[1
]}

Zhang, Peng ^{[1
]}

Qian, Huifeng ^{[2
]}

Jin, Rongchao ^{[2
]}

机构：

[1] Dalhousie Univ, Dept Chem, Halifax, NS B3H 4J3, Canada

[2] Carnegie Mellon Univ, Dept Chem, Pittsburgh, PA 15213 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 51期

基金：

加拿大自然科学与工程研究理事会;

关键词：

OPTICAL-ABSORPTION SPECTRA; AU-25; CLUSTERS; GOLD NANOPARTICLES; CRYSTAL-STRUCTURE; AU; CATALYSIS; STABILITY; EXAFS; SIZE; SPECTROSCOPY;

D O I：

10.1021/jp310183x

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：

We report element-specific X-ray spectroscopy results on the structure and bonding of Au24Pt, a thiolate-protected bimetallic nanocluster. Platinum L-3-edge extended X-ray absorption fine-structure (EXAFS) data, in association with X-ray photoelectron spectroscopy (XPS) compositional analysis, was used to identify the location of the Pt dopant to be in the center of the icosahedron Au-13 core. Comparison of Au24Pt with the structure of Au-25 by gold L-3-edge EXAFS clearly shows contraction of both metal-thiolate and metal-metal bond distances, caused by Pt doping. The doping effect on the electronic properties of Au24Pt was further evaluated by high-resolution Au 4f core-level XPS and ab initio calculations, which elucidate the importance of bimetallic (Pt-Au) bonding and bond contraction effects on the properties of Pt-doped thiolate-gold nanoclusters.

引用

页码：26932 / 26937

页数：6

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