fig2

Figure 2. (A) Schematic illustration of the synthesis of three types of Ag@Cu heterostructures, (B-D) TEM images of Ag@Cu-p2.8 (B), Ag@Cu-p4.9 (C), and Ag@Cu-p11.2 (D)^[77]. (E) Schematic illustration of the synthesis process of Cu@Ag core-shell nanoparticles^[37].