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TEM images of metal oxide/TiO2 hybrid nanotubes (a–d: Zr, e–h: Nb, and i–l: Si). Ti:Zr = 9:1 (a); 8:2 (b); 7:3 (c) and 6:4 (d); Ti:Nb = 9:1 (e), 8:2 (g) and 6:4 (h); Ti:Si = 9:1 (i), 8:2 (j), 7:3 (k) and 6:4 (l). Scale bars are 0.2 µm. Reproduced from Reference [86].
