413692.fig.003a
(a)
413692.fig.003b
(b)
413692.fig.003c
(c)
413692.fig.003d
(d)
413692.fig.003e
(e)
Figure 3: SEM images of TiO2 nanofibers. (a) As-spun nanofibers. (b)–(e) Fibers calcined in air for 3 h at 400, 600, 800, and 1,000°C, respectively.