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A) The optical extinction spectra for the different nanostructures formed: AuNP (pink line), Au@Ag core−shell structures (orange line), and WICN (dark blue line). B) Photographs of solutions of the different structures showing the color change which occurs during the shape engineering of gold Wulff structures, as well as corresponding TEM images (The scale bar is the same in each panel and it is equal to 50 nm). C) Effect of WICN on the viability of several cell lines.
