Figure 4.
SEM images of the prepared samples of (a) SR, (b) SR-5m, (c) SR-5n, (d) SR-30m and (e) SR-30n.
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.