Optical and Morphological Properties of ZnO- and TiO₂-Derived Nanostructures Synthesized via a Microwave-Assisted Hydrothermal Method

Figure 3

(a) SEM, (b) TEM, (c) HRTEM micrographs of TiO₂ and (d) formation mechanism of TiO₂ nanotubes.

(a)

(b)

(c)

(d)