Fig. 4From: Ag Nanoparticles Located on Three-Dimensional Pine Tree-Like Hierarchical TiO2 Nanotube Array Films as High-Efficiency Plasmonic PhotocatalystsXPS spectra of Ag(30s)/TiO2: a high-resolution XPS of Ti 2p peaks, b high-resolution XPS of O 1s peaks, and c high-resolution XPS of Ag 3d peaksBack to article page