Photocatalytic Properties of Size-Controlled Titania Nanotube Arrays

Figure 1

FE-SEM images of titania nanotube arrays (TNAs) formed by anodization for 5 h in electrolyte solutions: (a) without H₂SO₄ at 20 V, (b) with H₂SO₄ at 20 V, and (c) with H₂SO₄ at 50 V. Insets show cross-sectional images.

(a)

(b)

(c)