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SEM images of TNTs samples.
Notes: (A, a) air-TNTs and (B, b) H2-TNTs. A and B show the surface of samples while the a and b show the cross section of samples.
Abbreviations: SEM, scanning electron microscopy; air-TNTs, air-annealed TiO2 nanotubes; H2-TNTs, hydrogenated TiO2 nanotubes.
