Fig. 2.
Preparation of monodispersed Pt12 clusters from [Pt(µ-SC8H17)2]12 complexes. a Direct conversion scheme from a complex to a cluster by reduction in a hydrogen atmosphere. b XPS of the [Pt(µ-SC8H17)2]12 complexes in Pt 4f 7/2 and Pt 4f 5/2 regions before and after calcination at 250 °C under a hydrogen stream. Pt12@DPA is the previously synthesized sample prepared with a phenylazomethine dendrimer in ref. 19. c A dark-field STEM image of the calcined sample supported on carbon (Ketjenblack). Inset shows a high-magnification aberration-corrected STEM image. Scale bar, 20 nm. d Atomic scale high-magnification STEM images of the monodispersed clusters (Pt5–Pt12). Scale bar, 1 nm