Fig. 2. The core–shell nanoparticles synthesized by seed-mediated selective electrodeposition: (a) Au–Fe, (b) Au–Co, (c) Au–Ni, and (d) Au–Cu. The nanoparticles are displayed by TEM/HAADF-STEM micrographs and the elemental maps revealed the core–shell arrangement of the component metals. The black scale bars are 200 nm and the white scale bars are 1 μm in length.
