Fig. 2From: Titania nanotubes prepared by rapid breakdown anodization for photocatalytic decolorization of organic dyes under UV and natural solar lightTEM images of TNTs. a As-prepared TNTs with one end open and other closed as shown in inset (figure inset scale bar = 10 nm), TNTs annealed at b 250 °C, c 350 °C (nanorod transformation), and d 450 °CBack to article page