909473.fig.005a
(a)
909473.fig.005b
(b)
909473.fig.005c
(c)
909473.fig.005d
(d)
Figure 5: TEM images of (a), (b), and (c) TiO2-NTs@@SiO2 with “open-ended” structure (650°C, 2 h). (d) TiO2-NRs@@SiO2 with “close-ended” structure (700°C, 2 h).