Plots summarizing the dependence of size on the concentration of AgNO3 for the four syntheses involving two different types of capping agents for both Au seeds and Au@Ag cubes: (a, c) CTAB-Au seeds were used for the growth of silver in solutions containing (a) CTAC and (c) CTAB, respectively. (b, d) CTAC-Au seeds were used for the growth of silver in solutions containing (b) CTAC and (d) CTAB, respectively. The sizes refer to the edge length for the Au@Ag cubes, and the diameter for the spherical Au seeds, respectively.