Figure 4.

FESEM images of TiO2 nanotubes fabricated in 0.5 wt% aqueous-based HF electrolyte via second-step anodization: (a) top surface view at low magnification, (b) top surface view at high magnification, (c) top surface view of patterned Ti-substrate anodized for 10 min, and (d) cross-sectional view.

Ali et al. Nanoscale Research Letters 2011 6:332   doi:10.1186/1556-276X-6-332
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