Figure 4.
SEM images of microhole arrays with different periods. (a) 3.6 μm period; (b) 3.0 μm period; (c) 2.6 μm period.
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.