Fig. 4.
SEM results of (A) ESM/TPU double-layer cross-section, (B) enlarged magnification of (A), (C) ESM cross-section, and (D) TPU cross-section.
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.