Figure 5
HAXPES spectra of the Au 4f region obtained with 5 keV photons of (orange) a 40 nm Au film and of (blue) a dispersion of Au NPs on a 25 nm-thick membrane in air and (red) a dispersion of Au NPs in MilliQ water in a static liquid cell. The green line corresponds to a previously measured Au film treated with oxygen plasma and measured with 1486.6 eV photons (Esplandiu et al., 2018). The blue and red spectra have been shifted by +1.1 and −2.3 eV, respectively. The dashed line indicates the position of the oxidized Au 4f7/2 peaks. |