Figure 5.

FESEM images of TiO2 nanotubes fabricated in glycerol containing 0.5 wt% NH4F and 0.2 wt% H2O 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, (d) cross-sectional view at low magnification, (e) cross-sectional view of the marked area at high magnification.

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