Figure 2From: Preparation of TiO2 nanotube/nanoparticle composite particles and their applications in dye-sensitized solar cellsFE-SEM images of TiO 2 nanoparticles and TNT films. (a) TiO2 nanoparticles made by the sol-gel method and (b) TNT films made by the hydrothermal method at 150°C for 12 h.Back to article page