Figure 1.

Synthesis and characterization of Au–Ag nanoshells. A) Schematic illustration of the Au–Ag shells growth based on galvanic replacement reaction in the presence of 2 mm sodium citrate. TEM images of aliquots taken from the reaction when B) 1.0, C) 2.5, and D) 10.0 mL HAuCl₄ was injected. Insets show the magnified TEM images (B,C) and HAADF‐STEM image (D) of individual particles. Scale bars in insets are 10 nm. E) EDX mapping image of an individual particle shown in (D).