Figure 2

Large-scale FESEM images of the top (a) and back (b) sides of the TNTs array on the Ti wire; (c) large-scale and (d) enlarged FESEM image of the TNTs array being lifted off from the underlying surface; (e) FESEM image of the underlying bumpy surface of an inner Ti wire core; (f) FESEM image of the TNTs prepared by anodization of the Ti wire at 30 V in an electrolyte of ethylene glycol containing 0.20 wt% NH₄F.