Figure 3.

XRD patterns of (a) Ti substrate and (b) heat-treated TiO2 nanotubes for 3 h at 350°C in air. The nanotubes were formed at an applied potential of 25 V for 2 h in 1 M H3PO4 + 0.3 M HF solution at 20°C.

Koo et al. Nanoscale Research Letters 2013 8:124   doi:10.1186/1556-276X-8-124
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