Figure 3.
Cu 2p XPS spectra for the (a) 2, (b) 5, (c) 10, and (d) 20% Cu-doped TiO2 anatase films showing the presence of Cu(0), Cu(I), and Cu(II) oxidation states.
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.