Facile Synthesis of Template-Induced SnO₂ Nanotubes

Figure 3

SEM images of SnO₂ nanotubes at different dosage of NaOH: (a) 0.4 g, (b) 0.8 g, (c) 1.2 g, (d) 1.6 g.

(a)

(b)

(c)

(d)