this kind oftubular structures is described as fibers. The fringes parallel to thefibers correspond to an interplanar distance of about 0.81 nm. TheFast Fourier Transform (FFT) pattern shows characteristics classi-fied as (2 0 0) according to the results obtained by XRD. Finally, theNW sample, which is related to the morphology of TiO2nanowires,showed a tendency to form curled wires. The fast Fourier Trans-form (FFT) pattern shows characteristic planes classified as (2 0 0),which are consistent with the planes found in the XRD related tothe H2Ti5O11·H2O structure, see Fig. 2(D) [6]. As for nanofibers andnanowires, the main difference with respect to nanotubes is thatnanofibers and nanowires lack of a hollow core, but they do showlarge pores attributed to external diameters; another aspect dis-played by nanofibers and nanowires it has to do with a well-definedtube morphology. Most nanofibers have a curly shaped morphol-ogy, composed of a multilayer structure with lengths ranging from15 to 30 nm and uneven surfaces as shown in Fig. 2(C). Finally, itwas found that by modifying the Ti/Na ratio, reaction tempera-ture and annealing treatment, the final morphology of the titanatenanotubes is modified, obtaining nanotubes, fibers and wires.