Fig. 3: 3D atomically diffuse core-shell interfaces in three particles.
From: Probing the atomically diffuse interfaces in Pd@Pt core-shell nanoparticles in three dimensions
a–c Atomic slices of PB (a), EPB (b), and TO (c) show diffuse core-shell interface in each particle. Scale bar for a–c, 2 nm. d Distribution of isolated Pd atoms in TO particle. The gray and cyan contours show the full nanoparticle and the Pd core, respectively. e A representative cut-out from the Pd-Pt interface in TO. f Radially-averaged Pd (blue lines) and Pt (red lines) concentrations along the core to the shell, where the diffuse interface is highlighted by blue patch. g Mean Pd CN around Pt (labeled as CN-PtPd) and Pt CN around Pd (labeled as CN-PdPt) in each layer. The dotted black lines in f and g mark the zero-depth position. h Histogram of isolated Pd and Pt atoms at the interface. i Distribution of the distances from the isolated Pd atoms to the middle of the interface for all particles. Zero depths in f–i are defined as where the Pd concentration for each particle meets 50%. In a–e, green balls and yellow balls represent Pd and Pt atoms, respectively.
