Figure 2.

FESEM images of TiO2 nanotubes fabricated in EG containing 0.5 wt% NH4F and 0.2 wt% H2O via first-step anodization: (a) top surface view, (b) bottom surface view, (c) cross-sectional view, and (d) top view of Ti-substrate after separation of TiO2 nanotubes.

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