Figure 2.

Electronic property characterization of alloy particles produced by CCM. (a) Spatially resolved Kelvin-probe measurements of the sample showing a decreasing work function in regions with increased Ag concentration; the color bar was derived from predicted compositions according to Figure 1(c)). (b) Local UV–vis absorption spectra at different sample locations corresponding to different compositions of Ag_xAu_1–x, showing a smoothly varying transition between pure Ag and Au plasmonic resonances. (c) Transient absorption spectra (TAS) with 400 nm pump and 450–800 nm probe of alloys with different Ag_xAu_1–x compositions indicating an SPR decay feature around 550 nm. (d) Extracted SPR decay times vs composition (more details in Supporting Information).