Figure 3
(A) UV-Vis diffusive absorption spectra and (B) XRD patterns of TiO2 nanotube arrays and heterostructured Cr-doped SrTiO3/TiO2 nanotube arrays. (C) XPS spectra and (D) high-resolution Cr 2p XPS spectra of the 0.5 h treated sample.
Figure 3 | Scientific Reports
