Fig. 2. (a) SEM image of Ag NPl4 used as template seeds. The typical TEM images of (b) Ag–Au1 (x = 0.1 μmol), (c) Ag–Au2 (x = 0.2 μmol), (d) Ag–Au3 (x = 0.4 μmol), (e) Ag–Au4 (x = 0.6 μmol), (f) Ag–Au6 (x = 1.0 μmol), (g) Ag–Au9 (x = 2.0 μmol) and (h) Ag–Au12 (x = 3.4 μmol). Insets in each image are photographs of the corresponding bimetallic Ag–Au core/shell or alloy solutions.
