Fig. 2From: Ag Nanoparticles Located on Three-Dimensional Pine Tree-Like Hierarchical TiO2 Nanotube Array Films as High-Efficiency Plasmonic Photocatalysts a Cross-sectional SEM image, b SEM image and magnified image (the inset), c XRD pattern, and d Raman spectrum of three-dimensional pine tree-like hierarchical TiO2 nanotube arraysBack to article page