Fig. 1.
TEM images of Fe@C/Fe (a), Fe@C (b), Fe@C–COOH (c) and Fe@C–(CH2)COOH (d). Carbon encapsulates with empty core are arrowed
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.