Fig. 22.
Schematic illustrations of a overall formation process and b the synthetic mechanism of 3D VAGNAs (Reprinted with the permission from Ref. [92])
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.