Fig. 4From: Well-Aligned TiO2 Nanotube Arrays with Ag Nanoparticles for Highly Efficient Detection of Fe3+ IonPhotoelectron spectroscopy of the spectra of Ag in (a); and the spectroscopies of TiO2 Nanotubes with/without Ag Deposition in (b), (c) and (d) Measured by XPS, respectivelyBack to article page