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. Author manuscript; available in PMC: 2021 Jun 24.
Published in final edited form as: J Am Chem Soc. 2020 Jun 9;142(25):10921–10925. doi: 10.1021/jacs.0c03342

Figure 3.

Figure 3.

Morphology evolution of Au nanostructures during the plasmon-driven growth. (A) A SEM image of Au hexagonal nanoprisms formed in the initial 20-min iodide-free growth; (B) A SEM image of Au dodecagonal structures formed after a further 30-min growth from (A) in the presence of KI; (C) A SEM image of Au nanostars formed after another 30-min growth from (B) in the presence of KI. Scale bars in all SEM images correspond to 100 nm. (D) A schematic showing the preferential etching (red arrows) at high-index edges that caused nonuniform growths (blue arrows) along different lateral directions to form Au nanostars. Nanostructures shown in (A), (B), and (C) were isolated from the same batch of synthesis at corresponding time points.