909473.fig.001a
(a)
909473.fig.001b
(b)
909473.fig.001c
(c)
909473.fig.001d
(d)
Figure 1: TEM images of (a) titanate nanotubes, (b) TiO2-NTs@@SiO2 with “open-ended” structure (500°C, 2 h). (c) XRD pattern of TiO2-NTs@@SiO2 calcined at various temperatures. (d) TiO2-NRs@@SiO2 with “close-ended” structure (over 600°C, 2 h) and EDS spectra of the sample (inset).