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Issue 1, 2003
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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

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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.

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Publication details

The article was received on 25 Jul 2002, accepted on 31 Oct 2002 and first published on 14 Nov 2002


Article type: Paper
DOI: 10.1039/B207290D
Citation: Phys. Chem. Chem. Phys., 2003,5, 172-177
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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

    J. Radnik, C. Mohr and P. Claus, Phys. Chem. Chem. Phys., 2003, 5, 172
    DOI: 10.1039/B207290D

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