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(A) Schematic summarizing the synthesis of cubic Au nanoframes by first titrating Ag nanocubes (B) with HAuCl4 to form Au-Ag nanoboxes (C), and then etching with ferric nitrate to form thin-walled nanoboxes (D) and cubic nanoframes (E). Inset scale bars are 50 nm. Reproduced with permission from [90], Copyright 2007 American Chemical Society.
