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Schematic (A) and different stages (B-E) of the synthesis of Au-Ag octahedral containing Au nanorods: (B) TEM of Au nanorods, (C) TEM of Au@Ag nanocrystals, (D) SEM of Au@Ag nanocrystals, (E) TEM of Au@Ag nanocrystals after the galvanic replacement reaction. Inset scale bars are 30 nm. Reproduced with permission from [68], Copyright 2009 Wiley-VCH.
