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On the origin of binding energy shifts of core levels of supported gold nanoparticles and dependence of pretreatment and material synthesis

Radnik, Jörg and Mohr, Christian and Claus, Peter (2003):
On the origin of binding energy shifts of core levels of supported gold nanoparticles and dependence of pretreatment and material synthesis.
In: Physical Chemistry Chemical Physics, RSC Publishing, pp. 172-177, 5, (1), ISSN 14639076,
[Online-Edition: http://dx.doi.org/10.1039/b207290d],
[Article]

Abstract

X-ray photoelectron spectroscopy (XPS) investigations of supported nanoparticles smaller than 10 nm show a significant shift of the electron binding energy of core levels compared with the bulk values. In this work, such shifts were examined at differently supported and prepared gold nanoparticles for the 4f electron level. Special attention was paid to the influence of reducing pretreatment in hydrogen and, moreover, the influence of different oxide supports. Surprisingly, in most cases, lower binding energies than the Au 4f7/2of 84.0 eV were observed depending on the oxidic support as well as the pretreatment conditions. The origin of these differences of the core level values are discussed in terms of different models like electron transfer from the support to the particles, size and geometric effects. It seems that especially geometric factors like the particle shape play an important role.

Item Type: Article
Erschienen: 2003
Creators: Radnik, Jörg and Mohr, Christian and Claus, Peter
Title: On the origin of binding energy shifts of core levels of supported gold nanoparticles and dependence of pretreatment and material synthesis
Language: English
Abstract:

X-ray photoelectron spectroscopy (XPS) investigations of supported nanoparticles smaller than 10 nm show a significant shift of the electron binding energy of core levels compared with the bulk values. In this work, such shifts were examined at differently supported and prepared gold nanoparticles for the 4f electron level. Special attention was paid to the influence of reducing pretreatment in hydrogen and, moreover, the influence of different oxide supports. Surprisingly, in most cases, lower binding energies than the Au 4f7/2of 84.0 eV were observed depending on the oxidic support as well as the pretreatment conditions. The origin of these differences of the core level values are discussed in terms of different models like electron transfer from the support to the particles, size and geometric effects. It seems that especially geometric factors like the particle shape play an important role.

Journal or Publication Title: Physical Chemistry Chemical Physics
Volume: 5
Number: 1
Publisher: RSC Publishing
Divisions: 07 Department of Chemistry > Fachgebiet Technische Chemie > Technische Chemie II
07 Department of Chemistry > Fachgebiet Technische Chemie
07 Department of Chemistry
Date Deposited: 20 Mar 2009 08:59
Official URL: http://dx.doi.org/10.1039/b207290d
Identification Number: doi:10.1039/b207290d
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