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.
SEM images of Teflon AF1600 surfaces treated by oxygen plasma with energies of (a) 1, (b) 2, (c) 3, (d) 4.5, (e) 5, (f) 6, (g) 7, (h) 8, and (i) 9 kJ. All images are taken by tilting the samples by 30°. The length of the white bar in each image represents 500 nm. The framed area indicates the presence of nanosized structures with undercuts.
