Figure 3.

SEM images of various nanostructures obtained from sample II. (A) SEM image of the shuttle-like nanostructures accompanied by several irregular nanoarchitectures. (B) High-resolution SEM image of the shuttle-like nanostructures together with some irregular nanoarchitectures. (C) SEM image of a solid nanosphere and a shuttle-like nanostructure. (D) SEM image of several nanorods, nanoshuttles, and irregular species. The aging time is 15 min.