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(A) SEM and TEM (inset) images of Au nanocages. Reproduced with permission from Reference (212). American Chemical Society Copyright (2004). (B) SEM image of the Au nanoframes. Reproduced with permission from Reference (213). Copyright (2008) Springer. C, E are SEM images, and D, F are TEM images of single-walled nanotube of Au/Ag alloy and double-walled nanotube of Au/Ag alloy, respectively. Reproduced with permission from Reference (216). Wiley, Copyright (2008).
