Figure 1.
SEM images of the sample surfaces at different processing times: (a,b) 2 min, (c,d) 7 min, (e,f) 15 min, and (g,h) 22 min.
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.