Figure 4.

TEM images of as-synthesized bare TiO₂NPs by non-synchronous feeding with different starting Li₂O concentrations. (a) 25 mM (inset: the hydrothermally treated sample ‘a’ in a mixture of EtOH/H₂O = 1 at 150 °C for 24 h) and (b) 50 mM.