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. Author manuscript; available in PMC: 2008 Aug 8.
Published in final edited form as: Nano Lett. 2007 May 10;7(6):1764–1769. doi: 10.1021/nl070838l

Figure 2.

Figure 2

TEM and SEM (inset) images of (A) 50-nm Ag nanocubes; (B) Au/Ag alloy nanoboxes obtained by reacting the nanocubes with 4.0 mL of 0.2 mM HAuCl4 aqueous solution; and (C-F) nanocages and nanoframes obtained by etching the nanoboxes with 5, 10, 15, 20 μL of 50 mM aqueous Fe(NO3)3 solution. The inset in (F) was obtained at a tilting angle of 45 degrees, clearly showing the 3-D structure of a nanoframe. The scale bars in all insets are 50 nm. EDX analysis indicates the atomic ratio of Au:Ag was 15:85, 30:70, 45:55, 60:40 and 100:0 for samples in (B), (C), (D), (E), and (F), respectively.