Figure 5.

Controlled overgrowth of Ag for bimetallic nanocrystals. (A) Schematic illustration showing the site-selective growth of Ag on each cubic seed and corresponding transmission electron microscopy (TEM) images. Well-controlled bimetallic nanocrystals were fabricated along the directed size and number of facets on a cubic Pd seed. The white dashed lines in the TEM indicate the position of the cubic Pd seed. (B) Extinction spectra of the Pd–Ag bimetallic nanocrystals with Ag growing on different numbers of faces of the cubic Pd seed. The LSPR peak blue-shifted with the increase in the number of faces involved in the Ag growth. Reprinted with permission from [80]. Copyright 2012 American Chemical Society.