Fig. 5. SEM images of (a) typical appearance of TiO2 nanofibers after calcination at 500 °C for 3 h, and their surface morphology when prepared from the precursors with (b) ×0.5, (c) ×1.5 and (d) ×2.5 TiO2/polymer yield mass ratios. (e) TiO2 nanofiber diameter after calcination at 500, 750 and 1000 °C as a function of TiO2/polymer yield mass ratio in the precursor solution. Dotted lines show general trend.
