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.
(a) Nitrogen adsorption/desorption isotherm; the inset shows the pore size distribution as measured by the BJH model. (b) XRD pattern plotted with respect to Cu-Kα (1.54 Å). XPS spectra of (c) C 1s and (d) O 1s.
