Fig. 6

Elemental analysis of the typical AgPt and Pt NPs fabricated with the Ag21nm/Pt4.5 nm bilayers at 600 and 900 °C for 120 s. a, b SEM images of AgPt alloy nanoclusters. c, d Elemental phase map of Ag L and Pt M. e–(e-2) Elemental line profiles of Ag and Pt through the nanocluster. f EDS spectra of the AgPt alloy nanoclusters at 600 °C. g, h SEM images of Pt NPs. i, j Elemental phase maps. k–(k-2) EDS line profile through the typical Pt NP. l EDS spectra of Pt NPs at 900 °C. The EDS map, line profile, and spectra show the absence of Ag in the NPs at 900 °C due to the sublimation