Local, global and electronic structure of supported gold nanoclusters determined by EXAFS, XRD and XPS methods

被引：7

作者：

Aldea, Nicolae

Rednic, Vasile

Pintea, Stelian

Marginean, Petru

Barz, Bogdan ^{[1
]}

Gluhoi, Andreea ^{[2
]}

Nieuwenhuys, Bernard E. ^{[2
]}

Neumann, Manfred ^{[3
]}

Xie Yaning ^{[4
]}

Matei, Florica ^{[5
]}

机构：

[1] Univ Missouri, Columbia, MO 65211 USA

[2] Leiden Univ, Leiden Inst Chem, NL-2300 RA Leiden, Netherlands

[3] Univ Osnabruck, Fachbereich Phys, D-49069 Osnabruck, Germany

[4] Bejing Elect Positron Collider Natl Lab, Beijing Synchrotron Radiat Facil, Beijing, Peoples R China

[5] Univ Agr Sci & Vet Med, Cluj Napoca, Romania

来源：

SUPERLATTICES AND MICROSTRUCTURES | 2009年 / 46卷 / 1-2期

关键词：

Supported gold catalysts; X-ray diffraction; X-ray absorption spectroscopy; X-ray photoelectron spectroscopy; Metal-support interaction; Local and global structure; LINE PROFILE ANALYSIS; X-RAY-DIFFRACTION; NICKEL-CATALYSTS; FOURIER-ANALYSIS; METAL-CATALYSTS; NANOPARTICLES; PROGRAM; SIZE;

D O I：

10.1016/j.spmi.2008.12.033

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We analyze gold nanoclusters as supported catalysts by extended X-ray absorption fine structure, X-ray diffraction and X-ray photoelectron spectroscopy in order to determine their local, global and electronic structure. The present study points out a strong deformation of the local structure of the metal due to its interaction with oxide supports. We determine the particle size distribution and microstrain functions of the Au nanoclusters by X-ray diffraction method. Based on X-ray absorption fine structure spectroscopy analysis we show that the entire local structure of the investigated systems is strongly distorted regarding the average Au-Au coordination number. The distances between atoms are practically the same as standard Au foil. The strong metal-support interaction is confirmed by the change in shape of the electron transition probability densities that appear in the Au L(III)-edge. From XPS investigations we find electronic states corresponding to gold as well as to the oxide supports. (C) 2009 Published by Elsevier Ltd

引用

页码：141 / 148

页数：8

共 17 条

[1]

Aldea N, 2005, J OPTOELECTRON ADV M, V7, P3093

[2]

Aldea N, 2004, J OPTOELECTRON ADV M, V6, P225

[3] Investigation of supported nickel catalysts by X-ray absorption spectrometry and X-ray diffraction using synchrotron radiation [J].