Fig. 5: Schematic of the proposed mechanism of core-shell growth for Pd@Pt CS-NPs.
From: Probing the atomically diffuse interfaces in Pd@Pt core-shell nanoparticles in three dimensions
The Pd seed was dispersed in oleylamine. A few surface Pd atoms was ionized and formed an electric double layer around the seed. After the Pt precursor was added to the solution, Pt and Pd ions were reduced simultaneously on the surface of the Pd seed to form the diffuse Pd-Pt interface with some possible substitution of Pd(0) to Pd(II) by Pt(IV). After the core was completely wrapped by Pt atoms, the shell continued to grow heteroepitaxially on the core to form the final particle. Here the atomic model of particle EPB is used for illustration. Green balls and yellow balls represent Pd and Pt atoms, respectively.
