Figure 3.

SEM images of the feather-like AlN nanostructures: a a low-magnification SEM image; b, c typical SEM images of a complete feather-like AlN nanostructure; d, e high-magnification SEM images show a scale-shaped fine structure of the feather-like products. The angle between the trunk and its branches (α) marked in (c) and (d) is about 30°.