Figure 3From: Preparation, characterization, and application of titanium nano-tube array in dye-sensitized solar cellsSEM images of top view of (a) TNA, (b) TNA-TiCl 4 , and (c) TNA-TnB. The inset images are the side view of (a) TNA, (b) TNA-TiCl4, and (c) TNA-TnB. TNA, TiO2 nano-tube array; TNA-TnB, TiO2 nano-tubes after titanium (IV) n-butoxide treatment; TNA-TiCl4, TiO2 nano-tubes after titanium tetrachloride treatment.Back to article page