Engineering Metal Nanostructure for SERS Application

Figure 3

TEM images of Ag colloids: (a) sol-1, (b) sol-2, (c) sol-3, and (d) sol-4. All scale bars represent 50 nm. ((e)–(h)) Particle number distribution in Ag nanochains for related TEM images. The criterion to judge whether a group of Ag particles form a chain or not is that the distance between neighboring particles is less than the chain length of CTAB molecules. Reprinted with permission from [22]. Copyright 2007 American Chemical Society.