Figure 1.

Synthetic scheme and corresponding TEM of WICN formation. The procedure involves A) making 16 nm Au seeds, B) growing the seeds to be 68 nm in diameter, C) formation of a Ag shell around the Au cores via the reduction of Ag⁺ by AA, (D) GRR of Ag with Au to form an AuAg nanoshell, and (E) transforming the nanoshell into a nanocage. TEM images of F) 16 nm Au seeds, G) the 68 nm Au seeds used as template, H) Au@Ag core-shell structures, I) WICN synthesized using GRR (arrows show the porosities on the cage). The scale bar is 100 nm in each panel.