Research Article

Origin of Ferromagnetism in Ru and N Codoped TiO2 Nanotubes: Experiments and Theory Investigations

Figure 3

PL emission spectra of undoped TiO2, Ru doped TiO2, N doped TiO2, and Ru-N codoped TiO2 (a) at 300 K and (b) at 250 K.
(a)
(b)