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Au 4f spin-orbit coupling effects in supported gold nanoparticles

par Chenakin, Sergiy ;Kruse, Norbert
Référence PCCP. Physical chemistry chemical physics, 18, 33, page (22778-22782)
Publication Publié, 2016

Article révisé par les pairs

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Résumé :

Using X-ray photoelectron spectroscopy we examine the Au 4f spin-orbit components in Au 4f spectra of nanosized Au particles on a TiO2 support. In general, the peak ratios of the Au 4f7/2 and 4f5/2 excitations are found to deviate from the statistical ratio of 4:3 and their linewidths (FWHM) are not equal. We reveal that both the FWHM and the Au 4f7/2-to-4f5/2 peak ratios increase appreciably as the Au atomic concentration on the surface of the TiO2 support and the size of Au nanoparticles decrease. On the contrary, the Au 4f spin-orbit splitting remains essentially unchanged. Our findings are discussed in terms of alterations in the electronic band structure.