Figure 1.
SEM images of CA (a), FA (b), CNT(c), CA/FA (d), and CA/FA/CNT (e, f).
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.