The FESEM images of the as-prepared TiO2 nanowires are
shown in Fig. 1. An abundant mesh of TiO2 nanowires with diameters
ranging from 20–30 nm and lengths up to 1 lm can be seen
in Fig. 1(a–c), representing samples - as-prepared, annealed at
400 C and annealed at 500 C respectively.